ABB / General Electric THHQB2150ST1 Molded Case Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Quantity
ABB / General Electric THHQB2150ST1 - 50A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed for advanced control in commercial environments, the GE THHQB2150ST1 is a 50A, 2-pole molded case circuit breaker featuring an integrated shunt trip accessory. This allows facility managers to remotely disconnect power for emergency shutdowns. The Q-Line breaker installs into GE A-Series and ReliaGear lighting panelboards using a secure bolt-on connection. It delivers reliable thermal-magnetic protection with a 22 kAIC interrupt capacity at 120/240VAC and an internal common trip.Specifications
| Brand | ABB / General Electric |
|---|---|
| Series | THHQB |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 22kA @ 120/240VAC |
| Terminal Type | Box Lugs |
|---|---|
| For Use With | GE A-Series Panelboards, ReliaGear Lighting Panelboards |
| Wire Gauge | 8-3 AWG (Cu/Al) |
| Max Wire | 3 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 | Auxiliary Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 10C to 50C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
5 answersWhat does the ST1 suffix mean in the THHQB2150ST1 part number?
The ST1 suffix indicates the breaker includes a factory-installed 120V AC shunt trip mechanism. This allows the breaker to be tripped remotely by an external control signal, which is frequently required for emergency power-off (EPO) systems or automated equipment shutdowns.
Can I install the THHQB2150ST1 in a standard GE Powermark Gold load center?
No. The THHQB2150ST1 is a bolt-on circuit breaker designed exclusively for commercial panelboards, such as the GE A-Series and ReliaGear lighting panels. Standard residential Powermark Gold load centers require plug-on breakers, such as the THQL series.
What is the difference between GE THQB and THHQB circuit breakers?
The H in the THHQB prefix stands for high interrupting capacity. While standard THQB breakers are typically rated for 10 kAIC, THHQB breakers like this one can safely interrupt fault currents up to 22 kAIC at 120/240V AC.
What does the LI trip function code indicate on this breaker?
The LI code stands for Long-Time and Instantaneous trip functions, which are the two components of a standard thermal-magnetic breaker. The Long-Time (thermal) element protects against sustained overloads, while the Instantaneous (magnetic) element trips immediately during a short circuit.
Does this breaker provide ground fault (GFCI) or arc fault (AFCI) protection?
No. The THHQB2150ST1 provides standard thermal-magnetic protection against overloads and short circuits, plus the remote shunt trip feature. It does not contain GFCI or AFCI circuitry.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
- JLJames L. L.Verified BuyerReviewingABB / General Electric THHQB21100 - 100A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/6/26ABB / General Electric THHQB21100
Fast Service and delivery, The breaker was as described and brand new! Great pricing and great Service. I paid extra for UPS ground, it was delivered quickly.
- SNScott N.Verified BuyerReviewingABB / General Electric THHQB32030 - 30A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars12/30/25Perfect
The correct breaker the first time - every time.
- AGAlejandra G.Verified BuyerReviewingABB / General Electric THHQB1140 - 40A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/4/25Everithing is good!
Everithing is good!
- LMLuis M.ReviewingABB / General Electric THHQB2145 - 45A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/19/23Good product and good service
Good product and good service
- SHScott H.ReviewingABB / General Electric THHQB2180 - 80A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/21/2280amp commercial breaker
Great how easy it was to order and how fast I got it. I will order one again when needed