ABB T4N150BW Molded Case Circuit Breaker
- 150A
- 3 Pole
- Panel Mount
Quantity
ABB T4N150BW - 150A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
The T4N150BW is a 3-pole, 150A molded case circuit breaker from ABB's SACE Tmax T4 family. Built for industrial power distribution, it provides reliable microprocessor-based protection. This panel-mount breaker installs into compatible ABB Tmax enclosures and switchboards. It is superseded by the XT4N 250 Ekip Dip LS/I for newer system upgrades. Rated 65kAIC at 240V, the adjustable LSI electronic trip unit allows for precise coordination advantages over standard thermal-magnetic devices.Specifications
| Brand | ABB |
|---|---|
| Series | T4 |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC, 600VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 25kA @ 500VDC, 16kA @ 600VDC |
| Amperage Range | 60-150A |
|---|
| Frame Type | T4 |
|---|---|
| Terminal Type | Lugs |
| For Use With | ABB Tmax Enclosures, Switchboards, Panelboards |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSI |
| Trip Function | Long-Time, Short-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Motor Operator, Rotary Handle, Mechanical Lugs |
|---|---|
| Accessories | Front Terminals Included, Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CCC, CSA, cULus, IEC, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Double Insulated, Positive Operation, Reverse Feed |
Product FAQs
8 answersWhat does the BW suffix mean in the T4N150BW catalog number?
In the ABB SACE Tmax nomenclature, the BW suffix indicates the breaker is equipped with a PR221DS electronic trip unit. This provides adjustable Long-Time, Short-Time, and Instantaneous (LSI) protection functions.
What is the modern replacement for the legacy T4N150BW?
The T4N150BW is part of the legacy SACE Tmax family. For new installations or system upgrades, ABB has superseded this model with the XT4N 250 series featuring the Ekip Dip LS/I trip unit. However, the T4N150BW remains the exact drop-in replacement for existing legacy panels.
Will the T4N150BW fit in a standard T4 250A breaker space?
Yes. Although it is sensored for a maximum of 150 amps, the T4N150BW shares the identical physical dimensions of the 250A T4 frame. It will mount seamlessly into any ABB Tmax enclosure or panelboard designed for T4 breakers.
Can I install auxiliary contacts or a shunt trip in the T4N150BW?
Yes, the ABB Tmax T4 frame is designed to accept a wide range of field-installable accessories. You can easily integrate internal modules like shunt trips, undervoltage releases, and auxiliary switches without modifying the breaker footprint.
What is the advantage of the electronic trip unit on the T4N150BW?
The microprocessor-based PR221DS trip unit provides highly accurate, adjustable overcurrent protection. This allows panel builders to achieve precise selective coordination with downstream devices, isolating faults more effectively than standard thermal-magnetic breakers.
How is the T4N150BW secured inside the panelboard?
This breaker utilizes a bolt-on connection type. It must be securely fastened to the panel busbar using the appropriate ABB T4 mounting hardware to ensure a reliable, high-amperage electrical connection.
Does the T4N150BW require an external power supply for the trip unit?
No, the PR221DS electronic trip unit is self-powered. It draws the necessary operating current directly from the primary phases passing through the breaker, requiring no external control voltage for standard overcurrent protection.
Is the T4N150BW rated for 100 percent continuous duty?
No, this standard UL 489 breaker is 80 percent rated. For a 150A breaker, the maximum continuous load (lasting 3 hours or more) should not exceed 120 amps to comply with National Electrical Code (NEC) requirements.
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