ABB T5H400TW Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Quantity
ABB T5H400TW - 400A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Delivering high interrupting capacity, the ABB T5H400TW is a 400A, 3-pole molded case circuit breaker. It features a thermal magnetic trip unit with fully adjustable settings, allowing precise calibration for specific load requirements. This unit mount breaker is engineered for ABB ReliaGear panelboards and motor control centers. It is replaced by the XT5HU340ABFF000XXX via a retrofit kit. Boasting a 150kAIC rating at 240VAC, it includes double insulation and is reverse feed compatible.Specifications
| Brand | ABB |
|---|---|
| Part Number | T5H400TW |
| Series | T5 |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 500VDC, 600VDC |
| Phase | 3 |
| AIC Rating | 150kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 65kA @ 250VDC, 50kA @ 500VDC, 35kA @ 600VDC |
| Amperage Range | 280-400A |
|---|
| Frame Type | T5 |
|---|---|
| Terminal Type | Lugs |
| For Use With | ABB ReliaGear Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 2/0 AWG - 250 kcmil |
| Max Wire | 250 kcmil |
| Min Wire | 2/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Motor Operator, Mechanical Interlock, Lug Kits, Terminal Shields, Bell Alarm |
|---|---|
| Accessories | Front Terminals Included, Lugs Not Included |
| Standards | CSA C22.2 No. 5.1, IEC 60947-2, UL 489 |
| Approval | CE, CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, High Interrupting Capacity, Positive Operation |
Product FAQs
10 answersWhat equipment is the T5H400TW designed to be installed in?
This breaker is engineered for integration into ABB ReliaGear panelboards, switchboards, and motor control centers. It utilizes a bolt-on connection for secure unit mounting within these enclosures.
What wire sizes are accepted by the factory lugs on this breaker?
The included lugs accept two conductors per phase, accommodating wire sizes from 2/0 AWG to 250 kcmil. Ensure proper torque specifications are applied during installation.
How does the adjustable thermal magnetic trip unit function on this model?
The T5H400TW features a Long-Time and Instantaneous (LI) trip configuration. This allows electricians to manually adjust both the thermal threshold for overload protection and the magnetic threshold for short-circuit response, providing precise calibration for specific load requirements.
Can the T5H400TW be used in DC power systems?
Yes, this breaker is rated for DC applications. It provides an interrupting capacity of 65kA at 250VDC, 50kA at 500VDC, and 35kA at 600VDC.
What does the H in the T5H400TW part number signify?
In the ABB SACE Tmax nomenclature, the H designates the High interrupting capacity tier. For this 400A frame, it delivers a maximum interrupting rating of 150kA at 240VAC and 65kA at 480VAC.
Can this breaker be reverse fed?
Yes, ABB Tmax series molded case circuit breakers can be fed from either the top or bottom terminals without any derating of their performance characteristics, making them suitable for reverse feed applications.
Does the mounting orientation affect the performance of the breaker?
No, the T5H400TW can be installed in either horizontal or vertical planes within panels and switchboards without derating its electrical performance.
Is this breaker part of the current ABB lineup or a legacy series?
The T5H400TW belongs to the legacy ABB SACE Tmax T5 frame series. It is commonly used to replace existing T5 breakers in older installations or for maintaining standardized equipment in existing facilities.
Does this breaker support the safe installation of internal accessories?
Yes, the T5H400TW features a double insulation construction. This design allows for the field installation of internal electrical accessories without exposing the installer to the energized power poles.
How does the toggle mechanism ensure safe operation?
The breaker features positive operation, meaning the toggle handle always indicates the precise physical position of the moving contacts. This guarantees safe and reliable visual signaling for maintenance personnel.
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