MT3400T - 400 Amp Trip Unit
- 400 Amp
- 600VAC
- 3 Pole
Purchase Options: New In Box
MT3400T - 400 Amp Trip Unit Description
MT3400T - 400 Amp Trip Unit
The MT3400T trip unit is a 400-amp, three-pole molded case circuit breaker accessory for you to use with compatible Type MDL and HMDL breakers. It uses the T266 trip type. It is configured for Series C and J-K frame applications, giving maintenance professionals several specific points to check when they're replacing an existing trip unit. With dimensions of 7 inches long/deep, 4 inches high, and 4 inches wide, the MT3400T also provides clearly documented physical measurements for verifying fit. These components are built to last, but always confirm compatibility before installation.
Key Features and Benefits
- 400A rating: Provides the specified 400-amp rating for compatible MDL and HMDL breaker applications.
- Three-pole configuration: Designed to match equipment requiring a three-pole trip unit.
- T266 trip type: Provides an important identification point when comparing the replacement unit with an existing component.
- MDL and HMDL breaker compatibility: Specifically listed for use with Type MDL and HMDL breakers.
- J-K frame size: Helps technicians verify mechanical and application compatibility before installation.
- Series C: Identifies the applicable product series and provides another useful compatibility reference.
Technical Specifications
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Catalog Number: MT3400T
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Product Type: Molded Case Circuit Breaker Accessory
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Component Type: Trip Unit
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Amperage Rating: 400A
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Number of Poles: 3
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Trip Type: T266
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Used With: Type MDL and HMDL Breakers
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Frame Size: J-K Frame
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Series: Series C
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Product Length/Depth: 7 in.
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Product Height: 4 in.
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Product Width: 4 in.
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Product Weight: 3 lb.
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UPC: 782114350188
Material Compliance and Certifications
The MT3400T is UL Listed according to the supplied manufacturer specifications. This certification is particularly useful when confirming that a replacement component meets the documentation requirements of an existing electrical installation.
Where It Works Best
The MT3400T 400A trip unit is for existing and legacy electrical equipment using compatible Type MDL or HMDL molded case circuit breakers where the required configuration calls for a 400A, three-pole T266 trip unit in a Series C J-K frame. This is especially relevant for maintenance and replacement work where preserving the required breaker configuration and physical fit matters.
Use of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer. CIRCUIT BREAKER SUPERSTORE® is an independent reseller and is not an authorized distributor, affiliate, or representative of any manufacturer. Manufacturer warranties do not apply unless expressly stated. All trademarks and registered trademarks are the property of their respective owners.
Eaton®, Cutler-Hammer®, Westinghouse®, Challenger®, Bussmann®, Edison®, Edison Fuse®, GTE Sylvania®, Crouse-Hinds®, and Cooper® are registered trademarks of Eaton Corporation plc. Products sold are surplus, used, or refurbished and are NOT supplied by Eaton Corporation plc or its affiliates.
Specifications
- Width:3.75
- Height:7.5
- Depth:3.38
- Poles:3
- Amperes:400
- A.I.C. Rating & Volts:600VAC
- Type:MT
- Sub-Category:TRIP UNIT
- Approx Dimensions:3.75"W x 7.5"L x 3.38"D
- Additional Notes:Thermal Magnetic Only for MDL & HMDL Frames. Magnetic Trip Adjustable 5-10 Times Continuous Ampere Rating. - discontinued by the Manufacturer
Returns are easy
You may return unused items within 30 days of delivery for a full refund.
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