ABB / General Electric TEY390ST12 Molded Case Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Quantity
ABB / General Electric TEY390ST12 - 90A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for advanced control, the GE TEY390ST12 is a three-pole MCCB featuring a 120-277VAC shunt trip. This allows users to remotely open the circuit for emergency shutdowns. The breaker utilizes a bolt-on mounting configuration, engineered to fit GE A-Series panelboards. Its standard one-inch per pole width maintains compatibility with Q-Line systems. Delivering 14kAIC at 480Y/277VAC, it provides reliable thermal-magnetic protection. Load lugs accept 4-1/0 AWG conductors.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | TEY390ST12 |
| Series | TEY |
| Amperage | 90A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120VAC, 240VAC, 480Y/277VAC, 250VDC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 120VAC, 65kA @ 240VAC, 14kA @ 480Y/277VAC, 10kA @ 250VDC, 65kA @ 120/240VAC |
| Frame Type | TEY |
|---|---|
| Terminal Type | Lugs |
| For Use With | GE A-Series Panelboards |
| Wire Gauge | 4-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 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 | Auxiliary Switch, Undervoltage Release, Bell Alarm, Padlock Attachment, Handle Tie |
|---|---|
| Accessories | Shunt Trip (120-277VAC) |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Quick-Make/Quick-Break, Non-Interchangeable Trip |
Product FAQs
6 answersWhat does the ST12 suffix mean on the TEY390ST12 part number?
The ST12 suffix indicates the breaker includes a factory-installed shunt trip. This accessory operates on a 120-277VAC control voltage, allowing the breaker to be opened remotely for emergency shutdowns or automated control.
Can I add a shunt trip to a standard TEY390 breaker in the field?
No. Internal accessories for GE TEY frame circuit breakers, including the ST12 shunt trip and auxiliary switches, are factory-installed only. You must purchase the breaker with the accessory already integrated.
Which panelboards accept the TEY390ST12 circuit breaker?
This bolt-on breaker is specifically designed for GE A-Series lighting panelboards. It utilizes a standard one-inch per pole width, maintaining compatibility with GE Q-Line systems.
Can the TEY390ST12 be used on ungrounded 480V delta systems?
No. The TEY390ST12 carries a slash voltage rating of 480Y/277VAC. This means it is strictly designed for use on solidly grounded wye systems and must not be installed on ungrounded or corner-grounded delta systems.
Will I receive a GE or ABB branded breaker when ordering the TEY390ST12?
You may receive either a GE or ABB branded unit. Following ABB's acquisition of GE Industrial Solutions, the branding on the label may vary depending on the manufacturing date. Both versions are identical in form, fit, and function, and are fully interchangeable.
Does the TEY390ST12 provide equipment ground fault protection?
No. This is a standard thermal-magnetic breaker equipped with fixed long-time and instantaneous (LI) trip functions for overload and short-circuit protection. It does not provide ground fault (GFPE or GFCI) or arc fault (AFCI) protection.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 43 reviews.
- SAShaenon A.Verified BuyerReviewingGeneral Electric TEYL1030B 1 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars9/21/26Everything was great!
Super easy and love the options and simple descriptions! Reasonable pricing too will ensure we are a reoccurring customer!
- MJmartin j.Verified BuyerReviewingABB / General Electric TEY320 - 20A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars8/26/26breaker replacement
fast service and great pricing .. Had this business up and running in No time ,, highly recommend SB
- CMCharles M.Verified BuyerReviewingABB / General Electric TEY320 - 20A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/4/26Just what I needed.
Received as advertised, and at a good price on time. Very satisfied.
- AMAlex M.Verified BuyerReviewingABB / General Electric TEY340 - 40A 3 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars5/12/26SuperBreakers are great.
Another breaker ordered. Arrived on time and fulfilled.
- AMAlex M.Verified BuyerReviewingABB / General Electric TEY130 - 30A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars5/12/26Breaker Ordered
Shipped correctly and on time. We will continue to use SuperBreakers!