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MU1-B-12-450-1-A21-B-E Littelfuse MU1-B-12-450-1-A21-B-E is a 5A, 250V, 1-pole magnetic hydraulic delay circuit breaker. It features panel mount and push-to-reset actuation.
Mfr Part #:

MU1-B-12-450-1-A21-B-E

Mfr Name: Littelfuse Inc.
Littelfuse Inc.
Littelfuse MU1-B-12-450-1-A21-B-E is a 5A, 250V, 1-pole magnetic hydraulic delay circuit breaker. It features panel mount and push-to-reset actuation.
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MU1-B-12-450-1-A21-B-E Specifications Quick View

Most important parameters for selection – full specs in datasheet.
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Actuator Type
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Current Rating (Amps)
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Mounting Type
Number of Poles
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MU1-B-12-450-1-A21-B-E Description

Short technical summary and product information.

The Littelfuse MU1-B-12-450-1-A21-B-E is a single-pole magnetic (hydraulic delay) circuit breaker rated for 5A at 250V. It is designed for panel mount installation and features a push-to-reset actuator. This circuit breaker provides reliable overcurrent protection with a hydraulic delay mechanism that handles inrush currents without nuisance tripping. The component is non-illuminated and RoHS compliant with an MSL of 1. It is suitable for a wide range of applications requiring dependable circuit protection.

MU1-B-12-450-1-A21-B-E Quick Information

Product Type: Circuit Breaker
Canonical Name: Littelfuse MU1-B-12-450-1-A21-B-E Magnetic (Hydraulic Delay) Circuit Breaker, 5A, 250V, 1 Pole, Panel Mount, Push to Reset
Subcategory: Magnetic (Hydraulic Delay) Circuit Breaker

MU1-B-12-450-1-A21-B-E Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

MU1-B-12-450-1-A21-B-E Features

  • Rated for 5A at 250V AC/DC.
  • Single-pole magnetic hydraulic delay design.
  • Panel mount with push-to-reset actuator.
  • Non-illuminated actuator.
  • RoHS compliant and MSL 1.

MU1-B-12-450-1-A21-B-E Applications

  • Overcurrent protection for industrial control panels
  • Branch circuit protection in power distribution
  • Motor starter protection in machinery
  • Panel mount circuit breaker applications
  • General equipment overcurrent protection

MU1-B-12-450-1-A21-B-E FAQs

7 frequently asked questions generated from this part’s specifications.
What is the voltage rating of the MU1-B-12-450-1-A21-B-E circuit breaker?

The voltage rating is 250V.

What is the current rating of the MU1-B-12-450-1-A21-B-E?

The current rating is 5A.

How many poles does the MU1-B-12-450-1-A21-B-E have?

It has 1 pole.

What type of circuit breaker is the MU1-B-12-450-1-A21-B-E?

It is a magnetic (hydraulic delay) circuit breaker.

What actuator type does the MU1-B-12-450-1-A21-B-E use?

The actuator type is push to reset.

Does the MU1-B-12-450-1-A21-B-E have an illuminated actuator?

No, it is non-illuminated.

What mounting type is the MU1-B-12-450-1-A21-B-E designed for?

It is designed for panel mount.

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