Square D Load-Center Circuit Breakers
Match these circuit breakers to Square D breaker boxes or panel boards of the same manufacturer series. They meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits. Because they are thermal-magnetic, these breakers trip two different ways. They either trip when heat is generated by sustained low-level overload current or quickly when the magnetic coil senses a high-current short circuit.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
For technical drawings and 3-D models, click on a part number.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | Mounting Location | Wire Connection Type | Wd. | Specifications Met | Each | |
QO Series | |||||||||
|---|---|---|---|---|---|---|---|---|---|
2 Pole—Toggle Style | |||||||||
| 60 | 120V AC/240V AC/48V DC | 50/60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC 5,000 A @ 48 V DC | Breaker Box | Snap On | 1 1/2" | UL 489, UL Listed | 00000000 | 000000 |
QOB Series | |||||||||
3 Pole—Toggle Style | |||||||||
| 60 | 120V AC/240V AC/48V DC | 50/60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC 5,000 A @ 48 V DC | Panel Board | Screw-Clamp Terminals | 2 1/4" | UL 489, UL Listed | 00000000 | 000000 |
Homeline Series | |||||||||
2 Pole—Toggle Style | |||||||||
| 60 | 120V AC/240V AC | 50/60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Breaker Box | Snap On | 2" | UL 489, UL Listed | 000000000 | 00000 |
Siemens Load-Center Circuit Breakers
Use with Siemens EQ series breaker boxes. These circuit breakers meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits. Because they are thermal-magnetic, they trip two different ways. They either trip when heat is generated slowly by consistent low-level overload current or quickly when the magnetic coil senses a high-current short circuit.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | Wire Connection Type | Wd. | Specifications Met | Each | |
2 Pole—Toggle Style | ||||||||
|---|---|---|---|---|---|---|---|---|
| 60 | 120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Screw-Clamp Terminals | 2" | UL 489 | 0000000 | 000000 |
Cutler-Hammer Load-Center Circuit Breakers
Install these circuit breakers into Cutler-Hammer CH series breaker boxes. They meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits. Because these circuit breakers are thermal-magnetic, they trip two different ways. They either trip when heat is generated slowly by consistent low-level overload current or quickly when the magnetic coil senses a high-current short circuit.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | Wire Connection Type | Wd. | Specifications Met | Each | |
2 Pole—Toggle Style | ||||||||
|---|---|---|---|---|---|---|---|---|
| 60 | 120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Screw-Clamp Terminals | 1 1/2" | UL 489 | 0000000 | 000000 |
High-Power Circuit Breakers
Protect an area of a facility that has high-powered equipment. These circuit breakers are also known as molded case circuit breakers. They meet UL 489 requirements for branch circuit protection. Because these breakers are thermal-magnetic, they trip two ways. They either trip when heat is generated slowly by consistent low-level overload current, or they trip quickly when the magnetic coil senses a high-current short circuit. A switch lets you adjust when these breakers magnetically trip, so you don't need to replace them as your application changes. These breakers have internal accessory slots to fit shunt trips, auxiliary contacts, and undervoltage trips, saving space in your setup.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
Shunt trips receive a signal from equipment to trip your circuit breaker in situations other than overload or short circuit conditions. For example, use them with a smoke detector to shut off power to a system in the event of a fire. 30A to 250A breakers can only have one shunt trip or undervoltage trip installed. 400A to 600A breakers can accommodate one shunt trip and one undervoltage trip at the same time.
Auxiliary contacts send a signal to other equipment when the circuit trips. They can activate a warning light, initiate a shutdown, or start a backup power source. Multiple auxiliary contacts can be used within one circuit breaker and can be placed in any of the accessory slots.
Undervoltage trips protect equipment from operating with less than their intended voltage by tripping a circuit breaker when the supply voltage drops below a set level. 30A to 250A breakers can only have one shunt trip or undervoltage trip installed. 400A to 600A breakers can accommodate one shunt trip and one undervoltage trip at the same time.
Install handles on the front cover of an electrical cabinet to turn these breakers on, off, or reset them without having to open the cabinet. Yet, these handles won’t prevent you from opening the electrical cabinet normally. You can also lock the handles in the on or off position with a padlock (not included) to prevent unauthorized changes to the circuit breaker.
For technical drawings and 3-D models, click on a part number.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | Inrush Current Setting, A | Mounting Location | For DIN Rail Size, mm | Mount Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
3 Pole—Toggle Style | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 60 | 480V AC/600YV AC/600V DC | 50/60 | 65,000 A @ 240 V AC 25,000 A @ 480 V AC 14,000 A @ 600 V AC 14,000 A @ 125 V DC 50,000 A @ 250 V DC 50,000 A @ 500 V DC 50,000 A @ 600 V DC | 300, 360, 420, 480, 540, 600 | DIN Rail | 35 | Screw On | 5.5" | 3" | 3" | -10° to 155° | UL 489, UL Listed, CE Marked, IEC 60947-2, IEC 81346-2 | 0000000 | 0000000 |
| Voltage | Current | Frequency, Hz | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 110-127V AC | 7.4 A @ 110 V AC | 50/60 | Screw-Clamp Terminals | 2.56" | 0.85" | 1.23" | -10° to 155° | UL 489, UL Listed, IEC 60947-2 | 0000000 | 0000000 |
| Voltage | Current, A | Frequency, Hz | Industry Designation | No. of Circuits Controlled | Switch Starting Position | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 24-300V AC/24-250V DC | 6 | 50/60 | DPST | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Screw-Clamp Terminals | 2.57" | 0.28" | 1.36" | -10° to 155° | UL 489, UL Listed, IEC 60947-2 | 0000000 | 0000000 |
| Voltage | Current | Frequency, Hz | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 120-127V AC | 0.01 A @ 120 V AC | 50/60 | Screw-Clamp Terminals | 2.56" | 1.01" | 1.13" | -10° to 155° | UL 489, UL Listed, IEC 60947-2 | 0000000 | 0000000 |
| For Circuit Breaker Current, A | Ht. | Wd. | Projection | Mounting Fasteners Included | For Max. Padlock Shackle Dia. | Padlock Included | Temp. Range, °F | Environmental Rating | Specifications Met | Each | |
| 30, 60, 100, 125 | 2.95" | 2.95" | 2.16" | Yes | 3/8" | No | -10° to 155° | IP65, NEMA 4X, NEMA 12 | IEC 60947-2 | 0000000 | 0000000 |
Harsh-Environment Circuit Breakers
Built to resist vibration and corrosion in harsh environments, these circuit breakers protect against overload and short circuits in low-voltage automotive and other electronic applications. All are thermal, so they use the heat generated in overcurrent situations to trip the breaker.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
Push-pull button and lever style breakers can be used as an on/off switch.
Place UL1077 rated breakers downstream from a branch circuit breaker to protect a single piece of equipment. They are also known as supplemental protectors.
For technical drawings and 3-D models, click on a part number.
| Current, A | Voltage | Breakthrough Current | For Panel Cutout Dia. | Dp. Behind Panel | Mount Type | Mounting Fasteners Included | Wire Connection Type | Temp. Range, °F | Specifications Met | Each | |
1 Pole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 60 | 28V DC | 6,000 A @ 28 V DC | 0.49" | 2.48" | Screw On | Yes | Screw Terminals | -65° to 165° | UL 1077, UL Recognized Component | 0000000 | 000000 |
Mounting Holes | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Current, A | Voltage | Breakthrough Current | Ht. | Wd. | Dp. | Mount Type | No. of | Dia. | Mounting Fasteners Included | Wire Connection Type | Temp. Range, °F | Specifications Met | Each | |
1 Pole | ||||||||||||||
| 60 | 48V DC | 1,500 A @ 48 V DC | 3.44" | 2.32" | 1.72" | Screw On | 3 | 0.19" | No | Screw Terminals | -40° to 185° | CE Marked | 00000000 | 000000 |
Mounting Holes | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Current, A | Voltage | Breakthrough Current | Ht. | Wd. | Dp. | Mount Type | No. of | Dia. | Mounting Fasteners Included | Wire Connection Type | Temp. Range, °F | Specifications Met | Each | |
1 Pole | ||||||||||||||
| 60 | 48V DC | 1,500 A @ 48 V DC | 2.89" | 1.9" | 1.44" | Screw On | 2 | 0.25" | No | Screw Terminals | -40° to 185° | CE Marked | 00000000 | 000000 |