Mfr Part #:

MU2-B-24-621-1-B21-B-C

The MU2-B-24-621-1-B21-B-C is a 2-pole magnetic hydraulic delay circuit breaker from Littelfuse. It is rated for 21A at 250V and features a push-to-reset actuator for panel mount applications.

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MU2-B-24-621-1-B21-B-C Description

Short technical summary and product information.

This Littelfuse MU2-B-24-621-1-B21-B-C is a 2-pole magnetic hydraulic delay circuit breaker designed for overcurrent protection. The hydraulic delay mechanism provides time-delay characteristics that accommodate temporary inrush currents without nuisance tripping, making it suitable for inductive loads.

Rated for 21A continuous current at 250V, the breaker uses a push-to-reset actuator for manual reset after a fault condition. The 2-pole configuration allows simultaneous interruption of both line conductors.

The breaker is designed for panel mount installation, fitting into standard cutouts. With no illumination, it is a simple, reliable component for industrial control panels and power distribution systems.

MU2-B-24-621-1-B21-B-C Quick Information

Product Type: Circuit Breaker

Canonical Name: Magnetic Hydraulic Delay Circuit Breaker, 21A, 250V, 2-Pole, Push-to-Reset

Subcategory: Magnetic (Hydraulic Delay) Circuit Breaker

MU2-B-24-621-1-B21-B-C Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

MU2-B-24-621-1-B21-B-C Features

Magnetic hydraulic delay overcurrent protection.
Rated for 21A at 250V.
Two-pole configuration for dual line switching.
Push-to-reset actuator for manual reset.
Panel mount design for easy installation.

MU2-B-24-621-1-B21-B-C Applications

Overcurrent protection for 250V AC circuits.
Suitable for panel-mount equipment applications.
Used in industrial power distribution panels.
Hydraulic-magnetic delay for nuisance trip prevention.

MU2-B-24-621-1-B21-B-C FAQs

6 frequently asked questions generated from this part’s specifications.

What is the current rating of this circuit breaker?

21A.

What is the voltage rating?

250V.

How many poles does this circuit breaker have?

2 poles.

What type of circuit breaker is it?

Magnetic hydraulic delay.

What type of actuator does it use?

Push to reset.

What is the mounting type?

Panel mount.

MU2-B-24-621-1-B21-B-C Alternate Parts

Same form/fit/function or matching attribute configuration across different manufacturers.

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MU2-B-24-621-1-A21-B-C

Littelfuse Inc.

Magnetic hydraulic circuit breaker rated for 21A at 250V. Features 2 poles and push-to-reset actuator.

View Part

Category	Circuit Breakers
Manufacturer Name	Littelfuse Inc.
Actuator Type	Push to Reset
Approval Agency	CCC, CSA, UL1077
Breaker Type	Magnetic (Hydraulic Delay)
Current Rating	21A
Current Rating (Amps)	21A
Illumination	None
Mounting Type	Panel Mount
Number of Poles	2
Voltage Rating	250V