Circuit Board Safety Relays
Reduce connection errors on circuit boards that control machine guards and other safety devices. Also known as force-guided contact relays, they have contact pairs that won’t close at the same time, even if contacts stick or weld shut. These relays take up less space on a board than those with electrical wiring because their solder pin terminals mount directly through circuit board holes. Use them to control high-power components, such as fans and heaters, from a low-power circuit.
Relays with a mechanical indicator show you whether they’re switched on or off with a flag. Peek through the window on the side to quickly check the flag’s position.
Relays with surge suppression coverage protect sensitive electronics from damage and malfunction by eliminating voltage spikes. Switching off a relay can generate surges of 300 to 500 volts, but a diode within these relays suppresses these surges. An LED indicator on these relays lights up when they’re on, so you know at a glance if they’re wired correctly.
For technical drawings and 3-D models, click on a part number.
| Number of Terminals | Input Voltage  | Control Current, mA | Switching Current @ Voltage | Max. Switching Voltage | Mechanical Life Cycles | Ht. | Wd. | Dp. | Pin Lg. | Features | Surge Suppression Coverage | Each | |
2 Circuits Controlled with 2 Off (Normally Open) or 2 On (Normally Closed)—DPDT | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 8 | 12V DC | 58 | 3 A @ 240 V AC/24 V DC | 250V AC, 125V DC | 10,000,000 | 1.1" | 0.5" | 1" | 0.16" | Interlocked Opposing Contacts, Mechanical Indicator | __ | 0000000 | 000000 |
| 8 | 24V DC | 29 | 3 A @ 240 V AC/24 V DC | 250V AC, 125V DC | 10,000,000 | 1.1" | 0.5" | 1" | 0.16" | Interlocked Opposing Contacts, Mechanical Indicator | __ | 0000000 | 00000 |
| 8 | 24V DC | 29 | 8 A @ 240 V AC | 250V AC | 10,000,000 | 1.1" | 0.5" | 1" | 0.2" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
4 Circuits Controlled with 2 Off (Normally Open) and 2 On (Normally Closed)—4PST-2NO/2NC | |||||||||||||
| 10 | 12V DC | 30 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 1.6" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 10 | 12V DC | 32 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 1.6" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
| 10 | 24V DC | 15 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 1.6" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 10 | 24V DC | 17 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 1.6" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
4 Circuits Controlled with 3 Off (Normally Open) and 1 On (Normally Closed)—4PST-3NO/1NC | |||||||||||||
| 10 | 12V DC | 30 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 1.6" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 10 | 12V DC | 32 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 1.6" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
| 10 | 24V DC | 15 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 1.6" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 10 | 24V DC | 17 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 1.6" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
6 Circuits Controlled with 3 Off (Normally Open) and 3 On (Normally Closed)—6PST-3NO/3NC | |||||||||||||
| 14 | 12V DC | 41 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 14 | 12V DC | 43 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
| 14 | 24V DC | 20 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 14 | 24V DC | 22 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
6 Circuits Controlled with 4 Off (Normally Open) and 2 On (Normally Closed)—6PST-4NO/2NC | |||||||||||||
| 14 | 12V DC | 41 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 14 | 12V DC | 43 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
| 14 | 24V DC | 20 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 14 | 24V DC | 22 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
6 Circuits Controlled with 5 Off (Normally Open) and 1 On (Normally Closed)—6PST-5NO/1NC | |||||||||||||
| 14 | 12V DC | 41 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 14 | 12V DC | 43 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
| 14 | 24V DC | 20 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts | __ | 0000000 | 00000 |
| 14 | 24V DC | 22 | 6 A @ 240 V AC/30 V DC | 250V AC, 125V DC | 10,000,000 | 0.9" | 0.5" | 2" | 0.14" | Interlocked Opposing Contacts, LED Indicator | Full | 0000000 | 00000 |
Safety Relays
Receive signals from safety monitoring relays or controllers to switch devices off and on because of a system failure. Also known as force-guided or mechanically linked contacts, the interlocking opposing contacts on these relays cannot be open or closed at the same time. To keep your system from receiving false switching signals, the interlocking opposing contact must remain open even if a contact welds closed.
IP20 rated, they have recessed terminals that prevent fingers and other objects from touching live circuits. These relays have been tested to safety standards that can help you achieve your system's PL (performance level) and SIL (safety integrity level). Choose a relay with a PL and SIL rating to meet the needs of your system. Higher ratings indicate greater safety protection. As your system becomes more complex, you generally require a higher safety protection level. Mount them to 35mm DIN rail (also known as DIN 3 Rail).
Relays that meet SIL2 are tested for applications with a probability of failure of 0.1% to 1%. They’re often used for emergency shutdowns, and fire, gas, and overpressure detection. Relays that meet SIL3 are tested for applications with a probability of failure of 0.01% to 0.1% and are used for preventing fires, explosions, or toxic releases. Relays that meet CAT 4 withstand circuit surges in electrical applications up to 600V.
When a failure is detected, relays with self-monitoring circuitry signal the controller to remove power and prevent restarting until the issue is resolved.
Relays with nondetachable contacts have auxiliary contacts that won’t separate from the relay if there is shock or vibration. Relays with mirror auxiliary contacts have contacts that are normally closed and cannot be open at the same time as a normally open main contact.
For technical drawings and 3-D models, click on a part number.
| Number of Terminals | Input Voltage | Control Current, mA | Switching Current @ Voltage | Max. Switching Voltage | Ht. | Wd. | Dp. | Features | Each | |
With Screw Terminals—DIN-Rail Mount | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
2 Circuits Controlled with 1 Off (Normally Open) and 1 On (Normally Closed)—DPST-1NO/1NC | ||||||||||
| 8 | 120V AC | 9 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |
| 8 | 24V DC | 38 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 00000 |
3 Circuits Controlled with 2 Off (Normally Open) and 1 On (Normally Closed)—3PST-2NO/1NC | ||||||||||
| 8 | 24V DC | 26 | 10 A @ 240 V AC | 250V AC | 3.5" | 0.7" | 2.4" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 00000 |
4 Circuits Controlled with 2 Off (Normally Open) and 2 On (Normally Closed)—4PST-2NO/2NC | ||||||||||
| 12 | 120V AC | 10 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |
| 12 | 24V DC | 42 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |
4 Circuits Controlled with 3 Off (Normally Open) and 1 On (Normally Closed)—4PST-3NO/1NC | ||||||||||
| 12 | 120V AC | 10 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |
| 12 | 24V DC | 42 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |
6 Circuits Controlled with 4 Off (Normally Open) and 2 On (Normally Closed)—6PDT-4NO/2NC | ||||||||||
| 16 | 120V AC | 10 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |
| 16 | 24V DC | 42 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |
6 Circuits Controlled with 5 Off (Normally Open) and 1 On (Normally Closed)—6PDT-5NO/1NC | ||||||||||
| 16 | 24V DC | 42 | 6 A @ 240 V AC | 250V AC | 3.4" | 0.9" | 3.9" | Interlocked Opposing Contacts, Recessed Terminals, LED Indicator | 00000000 | 000000 |
| Number of Terminals | Input Voltage | Control Current, mA | Switching Current @ Voltage | Max. Switching Voltage | Auxiliary Contact Switch Starting Position | Ht. | Wd. | Dp. | Features | Each | |
With Spring-Clamp Terminals—DIN-Rail Mount | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO | |||||||||||
| 18 | 24V AC, 24V DC | 5 | 5 A @ 120 V AC | 230V AC | 1 On (Normally Closed) | 3.9" | 0.9" | 4.8" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, LED Indicator | 00000000 | 0000000 |
hp @ Switching Voltage | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Terminals | Input Voltage | Control Current, mA | Switching Current @ Voltage | Max. Switching Voltage | Single Phase | Three Phase | Auxiliary Contact Switch Starting Position | Ht. | Wd. | Dp. | Features | Each | |
With Screw Terminals—DIN-Rail and Surface Mount | |||||||||||||
3 Circuits Controlled with 3 Off (Normally Open)—3PST-NO | |||||||||||||
| 18 | 120V AC | 2 | 7 A @ 400 V AC | 600V AC | 1/4 hp @ 120 V AC 1 hp @ 240 V AC | 2 hp @ 240 V AC 3 hp @ 480 V AC 5 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 2.7" | 1.8" | 4.6" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 0000000 |
| 18 | 120V AC | 2 | 9 A @ 400 V AC | 600V AC | 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC | 3 hp @ 240 V AC 5 hp @ 480 V AC 7 1/2 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 2.7" | 1.8" | 4.6" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
| 18 | 120V AC | 2 | 12 A @ 400 V AC | 600V AC | 1 hp @ 120 V AC 2 hp @ 240 V AC | 3 hp @ 240 V AC 10 hp @ 480 V AC 10 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 2.7" | 1.8" | 4.6" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
| 18 | 120V AC | 5 | 18 A @ 400 V AC | 600V AC | 2 hp @ 120 V AC 3 hp @ 240 V AC | 5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 3.4" | 1.8" | 5.5" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
| 18 | 120V AC | 5 | 25 A @ 400 V AC | 600V AC | 2 hp @ 120 V AC 5 hp @ 240 V AC | 10 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 3.4" | 1.8" | 5.5" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
| 18 | 24V DC | 3 | 18 A @ 400 V AC | 600V AC | 2 hp @ 120 V AC 3 hp @ 240 V AC | 5 hp @ 240 V AC 10 hp @ 480 V AC 15 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 3.4" | 1.8" | 5.5" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
| 18 | 24V DC | 3 | 25 A @ 400 V AC | 600V AC | 2 hp @ 120 V AC 5 hp @ 240 V AC | 10 hp @ 240 V AC 15 hp @ 480 V AC 20 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 3.4" | 1.8" | 5.5" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
| 18 | 24V DC | 12 | 7 A @ 400 V AC | 600V AC | 1/4 hp @ 120 V AC 1 hp @ 240 V AC | 2 hp @ 240 V AC 3 hp @ 480 V AC 5 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 2.7" | 1.8" | 4.6" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
| 18 | 24V DC | 18 | 9 A @ 400 V AC | 600V AC | 1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC | 3 hp @ 240 V AC 5 hp @ 480 V AC 7 1/2 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 2.7" | 1.8" | 4.6" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
| 18 | 24V DC | 18 | 12 A @ 400 V AC | 600V AC | 1 hp @ 120 V AC 2 hp @ 240 V AC | 3 hp @ 240 V AC 10 hp @ 480 V AC 10 hp @ 600 V AC | 2 Off (Normally Open) or 3 On (Normally Closed) | 2.7" | 1.8" | 4.6" | Interlocked Opposing Contacts, Recessed Terminals, Self-Monitoring Circuitry, Nondetachable Auxiliary Contacts, Mirror Auxiliary Contacts, Inspection Window | 0000000 | 000000 |
Machine-Guard Relays
The interlocked opposing contacts won't close at the same time, so these relays are suitable for safety applications such as machine guarding. The screw terminals are recessed to prevent accidental contact with live connections. Mount them on 35 mm DIN rail (also known as DIN 3 rail) or flat surfaces. These relays are built to IEC dimensional standards.
Auxiliary contact (sold separately) allows you to add a signaling device or control another relay.
| Number of Terminals | Input Voltage | Control Current, mA | Switching Current @ 600V AC | Max. Switching Voltage | Ht. | Wd. | Dp. | Each | |
4 Circuits Controlled with 2 Off (Normally Open) and 2 On (Normally Closed)—4PST-2NO/2NC | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 10 | 24V AC | 125 | 10A | 600V AC | 2.3" | 1.7" | 2.2" | 00000000 | 000000 |
| 10 | 120V AC | 25 | 10A | 600V AC | 2.3" | 1.7" | 2.2" | 00000000 | 00000 |
| 10 | 240V AC | 12.5 | 10A | 600V AC | 2.3" | 1.7" | 2.2" | 00000000 | 00000 |
4 Circuits Controlled with 3 Off (Normally Open) and 1 On (Normally Closed)—4PST-3NO/1NC | |||||||||
| 10 | 24V AC | 125 | 10A | 600V AC | 2.3" | 1.7" | 2.2" | 00000000 | 00000 |
| 10 | 120V AC | 25 | 10A | 600V AC | 2.3" | 1.7" | 2.2" | 00000000 | 00000 |
| 10 | 240V AC | 12.5 | 10A | 600V AC | 2.3" | 1.7" | 2.2" | 00000000 | 00000 |
| Number of Circuits Controlled | Switch Starting Position | Industry Designation | Mounting Location | For Relay Width | Each | |
| 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | Front | 1.7" | 00000000 | 000000 |
Interface Safety Relays
These relays pair the transmission reliability of an interface relay with the fail-safe operation of a safety relay. Use them to communicate signals to devices like motors or sensors. They have interlocking contacts—also known as force-guided or mechanically linked contacts—so opposing contacts won't close at the same time. This minimizes the chance of arcing, so electricity won't jump across the contacts and interfere with your relay or system. They also have an interface that isolates input and output circuits to prevent damage from voltage spikes, reduce signal interference, and amplify signal. Mount them on 35 mm DIN rail (also known as DIN 3 rail). The relays disconnect from the socket for quick replacement.
Relays with LED indicator light up when the relay is on, so you’ll know it’s wired correctly and can tell at a glance whether it’s on or off.
Relays | Replacement Relays | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Terminals | Input Voltage | Control Current, mA | Switching Current @ Voltage | Max. Switching Voltage | hp @ Switching Voltage | Mechanical Life Cycles | Ht. | Wd. | Dp. | Features | Each | Each | ||
2 Circuits Controlled with 1 Off (Normally Open) and 1 On (Normally Closed)—DPST-1NO/1NC | ||||||||||||||
| 6 | 12V DC | 63 | 3 A @ 240 V AC/24 V DC | 250V AC, 125V DC | __ | 10,000,000 | 1.1" | 0.5" | 1.1" | Interlocked Opposing Contacts, LED Indicator | 0000000 | 000000 | 0000000 | 000000 |
2 Circuits Controlled with 2 Off (Normally Open) or 2 On (Normally Closed)—DPDT | ||||||||||||||
| 8 | 24V DC | 29 | 8 A @ 240 V AC | 250V AC | 1/2 hp @ 230 V AC | 10,000,000 | 3.1" | 0.6" | 2.4" | Interlocked Opposing Contacts | 0000000 | 00000 | 0000000 | 00000 |