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Square D Q1B2100 Molded Case Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Square D
Q1B2100
Molded Case Circuit Breaker
Brand
Square D
SKU
Q1B2100
Quantity
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Square D Q1B2100 - 100A 2 Pole Molded Case Circuit Breaker
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Description
Built to support aging electrical infrastructure, the Square D Q1B2100 provides 100A of reliable overcurrent protection. It features long-time and instantaneous trip functions for 120/240V commercial applications. Designed exclusively for bolt-on installation, this unit fits seamlessly into legacy Square D NQOB panelboards. Using this exact match avoids the need for the SK5668 mounting kit required when upgrading to newer QOB series breakers. It includes a Visi-Trip visual indicator.Specifications
| Brand | Square D |
|---|---|
| Series | Q1B |
| Amperage | 100A |
| 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 NQOB Panelboards |
| Wire Gauge | #4-2/0 AWG |
| Max Wire | 2/0 AWG |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| 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, Non-Interchangeable Trip |
Product FAQs
5 answersWhat panelboards are compatible with the Q1B2100 circuit breaker?
The Q1B2100 is a legacy bolt-on breaker designed exclusively for older Square D NQOB panelboards. It is not interchangeable with QO or Homeline load centers.
Is the Q1B series obsolete, and what is the modern replacement?
Yes, the Q1B series is obsolete. To replace a Q1B2100 with a modern equivalent, you must use a QOB2100 breaker paired with an SK5668 horizontal bus bar mounting kit to adapt it to the NQOB panelboard.
Do I need a mounting kit to install the Q1B2100 in an NQOB panelboard?
No, the Q1B2100 is an exact match for legacy NQOB panelboards and bolts directly to the bus. Mounting kits like the SK5668 are only required when upgrading to the newer QOB series breakers.
What type of trip unit does the Q1B2100 use?
It utilizes a fixed thermal-magnetic trip unit that provides long-time and instantaneous (LI) protection against overloads and short circuits.
What safety precautions apply when installing a bolt-on breaker like the Q1B2100?
Always de-energize the panelboard before installing or removing bolt-on breakers. Verify that the panel label explicitly lists Q1B breakers as an approved type, as installing incompatible breakers can lead to poor bus connections and equipment failure.
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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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Rating
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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