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Square D Q1B270 Molded Case Circuit Breaker
- 70A
- 2 Pole
- Bolt-On
Square D
Q1B270
Molded Case Circuit Breaker
Brand
Square D
SKU
Q1B270
Quantity
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Square D Q1B270 - 70A 2 Pole Molded Case Circuit Breaker
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Description
Built for commercial power distribution, the Square D Q1B270 is a 70A, two-pole molded case circuit breaker. It delivers reliable thermal-magnetic protection for 120/240VAC systems requiring a 10kAIC rating. This legacy breaker features a bolt-on design tailored for older NQO and NQOB panelboards. Facilities replacing this unit can utilize a QOB270 breaker with the SK5668 mounting kit. The unit accommodates #8-2 AWG wiring and includes a visual trip indicator to locate faults.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q1B270 |
| Series | Q1B |
| Amperage | 70A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q1B |
|---|---|
| Terminal Type | Box Lugs |
| For Use With | Square D NQO, NQOB Panelboards |
| Wire Gauge | #8-2 AWG |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, Common Trip |
Product FAQs
6 answersWhich panelboards are compatible with the Q1B270 circuit breaker?
This legacy bolt-on breaker is specifically designed for installation in older Square D NQO and NQOB panelboards.
What is the modern replacement for a Q1B270 breaker?
Because the Q1B series is a legacy product, it is commonly replaced by a modern QOB270 circuit breaker. However, installing a QOB breaker into an older NQOB panelboard requires an SK5668 mounting assembly kit to adapt the connection.
How is the Q1B270 secured inside the panelboard?
It utilizes a bolt-on connection, meaning it must be mechanically fastened to the panelboard bus bar rather than snapping into place. This provides a secure connection suitable for commercial applications.
What wire sizes are accepted by the terminals on the Q1B270?
The box lugs on this breaker are designed to accommodate wire gauges ranging from 8 AWG to 2 AWG. Ensure you torque the lugs to the manufacturer specifications during installation.
What type of protection does the Q1B270 provide?
It features a fixed thermal magnetic trip unit. The thermal component provides long time protection against sustained overloads, while the magnetic component offers instantaneous protection against short circuits.
Can I replace the Q1B270 with a standard QO plug-on breaker?
No. The Q1B270 is a bolt-on breaker. Plug-on QO breakers will not properly attach to the bus bars in NQOB panelboards. You must use a bolt-on replacement like the QOB series along with the required SK5668 adapter bracket.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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1 review
- MCMichael C.ReviewingSquare D Q1B3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/11/22Fast Service.
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