AA1-B0-21-620-3D1-C One-pole 20A 277V magnetic hydraulic delay circuit breaker from Littelfuse. Panel mount lever actuator for reliable overcurrent protection.
Mfr Part #:

AA1-B0-21-620-3D1-C

Mfr Name: Littelfuse Inc.
Littelfuse Inc.
One-pole 20A 277V magnetic hydraulic delay circuit breaker from Littelfuse. Panel mount lever actuator for reliable overcurrent protection.
Stock on Request

AA1-B0-21-620-3D1-C Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Actuator Type
Approval Agency
Breaker Type
Current Rating
Current Rating (Amps)
Illumination
Mounting Type
Number of Poles
Voltage Rating

AA1-B0-21-620-3D1-C Description

Short technical summary and product information.

The AA1-B0-21-620-3D1-C is a single-pole magnetic hydraulic delay circuit breaker from Littelfuse. Rated at 20A and 277V, it provides overcurrent protection with a time-delay characteristic that reduces nuisance tripping on moderate overloads.

 

The breaker features a panel mount design with a lever actuator for manual on/off control. It is approved by UL, CSA, and CCC, making it suitable for a wide range of industrial and commercial applications.

 

With its magnetic hydraulic delay mechanism, this breaker offers precise trip performance and high reliability. The compact 1-pole format fits standard panel cutouts and is ideal for use in distribution boards, control panels, and equipment power supplies.

AA1-B0-21-620-3D1-C Quick Information

Product Type: Circuit Breaker
Series: AA1
Canonical Name: AA1 Series 20A 277V 1-Pole Magnetic Hydraulic Delay Circuit Breaker
Subcategory: Magnetic (Hydraulic Delay) Circuit Breaker

AA1-B0-21-620-3D1-C Compliance

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

AA1-B0-21-620-3D1-C Features

  • 20A current rating for circuit protection.
  • 277V voltage rating for standard applications.
  • Single-pole magnetic hydraulic delay design.
  • Panel mount with lever actuator.
  • UL, CSA, and CCC approved.

AA1-B0-21-620-3D1-C Applications

  • Overcurrent protection in distribution panels.
  • Ideal for control circuit protection.
  • Used in commercial lighting and HVAC systems.
  • Suitable for industrial equipment power inputs.

AA1-B0-21-620-3D1-C FAQs

7 frequently asked questions generated from this part’s specifications.
What is the rated current of this circuit breaker?

20A.

What is the voltage rating of this breaker?

277V.

How many poles does this breaker have?

1 pole.

What type of breaker is this?

Magnetic (Hydraulic Delay) circuit breaker.

What is the mounting style?

Panel mount.

What approvals does this breaker have?

CCC, CSA, UL.

What actuator type is used?

Lever actuator.

AA1-B0-21-620-3D1-C Alternate Parts

Same form/fit/function or matching attribute configuration across different manufacturers.
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AA1-B8-32-620-161-C
Littelfuse Inc.
The Littelfuse Inc. AA1-B8-32-620-161-C is a 1-pole, magnetic (hydraulic delay) circuit breaker. It features a 20A current rating and a 277V voltage rating.
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AA1-B2-14-620-H22-C
AA1-B2-14-620-H22-C
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AA1-B2-14-620-H22-C is a single-pole magnetic hydraulic delay circuit breaker from Littelfuse. It is rated 20A at 277V with panel mount and lever actuator.
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AA1-B2-12-620-5D2-C
AA1-B2-12-620-5D2-C
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The Littelfuse Inc. AA1-B2-12-620-5D2-C is a magnetic hydraulic delay circuit breaker. It features a 20A current rating and a 277V voltage rating.
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AA1-B2-26-620-3B1-C
AA1-B2-26-620-3B1-C
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The Littelfuse Inc. AA1-B2-26-620-3B1-C is a single-pole circuit breaker designed for panel mounting. It features a magnetic hydraulic delay mechanism.
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