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Square D Load-Center Circuit Breakers
QOB Series, 1 Pole
QOB Series, 2 Pole
QOB Series, 3 Pole
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 | |
QOB Series | |||||||||
|---|---|---|---|---|---|---|---|---|---|
1 Pole—Toggle Style | |||||||||
| 15 | 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 | 3/4" | UL 489, UL Listed | 00000000 | 000000 |
| 20 | 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 | 3/4" | UL 489, UL Listed | 00000000 | 00000 |
| 30 | 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 | 3/4" | UL 489, UL Listed | 00000000 | 00000 |
| 40 | 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 | 3/4" | UL 489, UL Listed | 0000000 | 00000 |
2 Pole—Toggle Style | |||||||||
| 15 | 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 | 1 1/2" | UL 489, UL Listed | 00000000 | 00000 |
| 20 | 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 | 1 1/2" | UL 489, UL Listed | 00000000 | 00000 |
| 30 | 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 | 1 1/2" | UL 489, UL Listed | 00000000 | 00000 |
| 40 | 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 | 1 1/2" | UL 489, UL Listed | 00000000 | 00000 |
3 Pole—Toggle Style | |||||||||
| 15 | 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 |
| 20 | 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 |
| 30 | 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 |
| 40 | 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 |
| 50 | 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 |
| 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 |