Siemens QJ23B125H00S01 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Quantity
Siemens QJ23B125H00S01 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Part of the legacy Sentron QJ frame family, this 125A, 3-pole MCCB delivers reliable overcurrent protection for commercial environments. It features fixed thermal and magnetic trip elements for Long-Time and Instantaneous (LI) protection. Designed for unit-mount installations, it integrates into Siemens meter centers and panelboards. This unit is replaced by the HQR23B125 (requires S01QR2 accessory). This configuration includes a 120/240VAC shunt trip and a high 42kAIC rating at 240VAC.Specifications
| Brand | Siemens |
|---|---|
| Series | QJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC |
| Frame Type | QJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Meter Centers, Panelboards, Switchboards |
| Wire Gauge | 6 AWG - 300 kcmil (Cu), 4 AWG - 300 kcmil (Al) |
| Max Wire | 300 kcmil |
| Min Wire | 6 AWG (Cu), 4 AWG (Al) |
| 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, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs, Shunt Trip (120/240VAC) |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, Trip-Free Mechanism, High Interrupting Capacity |
Product FAQs
7 answersWhat does the "00S01" suffix mean in the QJ23B125H00S01 catalog number?
The "00S01" suffix indicates that this breaker is equipped with a factory-installed 120/240V AC shunt trip. This internal accessory allows the breaker to be tripped remotely for emergency shutdown or control applications.
What does the "H" designate in the QJ23B125H00S01 part number?
The "H" identifies this as a Type QJ2H high-interrupting circuit breaker. It provides a 42kAIC interrupting rating at 240V AC, which is significantly higher than the standard 10kAIC rating found on base QJ2 models.
Can I use a newer QR-frame breaker to replace this legacy QJ-frame model?
Yes. Siemens designed the newer QR-frame circuit breakers with the exact same form factor and mounting dimensions as the legacy QJ-frame. This allows for a direct physical retrofit in existing Siemens panelboards, switchboards, and meter centers.
Is the QJ23B125H00S01 rated for reverse feed applications?
Yes. Because this QJ-frame breaker is built with a non-interchangeable thermal-magnetic trip unit, it is UL Listed for reverse feed installations.
Can I adjust the trip settings on this circuit breaker?
No. The QJ23B125H00S01 features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous (LI) protection settings are factory calibrated and cannot be adjusted in the field.
Is the QJ23B125H00S01 suitable for HVAC applications?
Yes, this breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment that requires this specific protection.
How does this breaker mount into the panelboard?
This is a unit-mount device that utilizes a bolt-on connection. It fastens directly to the bus bars in compatible Siemens enclosures, providing a secure mechanical and electrical connection suitable for high-fault commercial environments.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 10 reviews.
- WMWilliam M.Verified BuyerReviewingSiemens QJ23B125 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26Breaker
Perfect
- TNTimothy N.Verified BuyerReviewingSiemens QJ23B200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/27/2610% off
Arrived on time, worked when turned on
- WKWillie K.Verified BuyerReviewingSiemens QJ23B150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars7/22/26Breaker
The Breaker arrive fast and in good condition however when I looked at the specs it was not the correct one.
- PGPhil G.Verified BuyerReviewingSiemens QJ23B200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/3/26Great Service
I was in a bind for this breaker that was for an elevator, and Nick got me all the components even though their blizzard! Will use them for all my specialty breakers.
- VCVladimir C.Verified BuyerReviewingSiemens QJ22B200 - 200A 2 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars12/10/254 start
The breaker was it perfect match.,but it was missing the two top bolts.