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AA1-B0-54-620-121-D The AA1-B0-54-620-121-D is a 20A 277V single-pole magnetic-hydraulic delay circuit breaker from Littelfuse. It features a lever actuator and panel-mount design.
Mfr Part #:

AA1-B0-54-620-121-D

Mfr Name: Littelfuse Inc.
Littelfuse Inc.
The AA1-B0-54-620-121-D is a 20A 277V single-pole magnetic-hydraulic delay circuit breaker from Littelfuse. It features a lever actuator and panel-mount design.
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AA1-B0-54-620-121-D 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
SVHC Present
Voltage Rating
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AA1-B0-54-620-121-D Description

Short technical summary and product information.

The Littelfuse AA1-B0-54-620-121-D is a single-pole magnetic-hydraulic delay circuit breaker rated for 20A continuous current at 277V AC. Its hydraulic delay mechanism provides precise overcurrent protection while withstanding harmless inrush currents.

 

The breaker features a lever actuator for manual ON/OFF control and a panel-mount design that simplifies installation into control panels or enclosures. It is approved by CCC, CSA, UL, and VDE, confirming compliance with international safety standards.

AA1-B0-54-620-121-D Quick Information

Product Type: Circuit Breaker
Canonical Name: AA1-B0-54-620-121-D 1-Pole 20A 277V Magnetic Hydraulic Delay Circuit Breaker
Subcategory: Hydraulic-Magnetic Circuit Breaker

AA1-B0-54-620-121-D Compliance

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

AA1-B0-54-620-121-D Features

  • 20A rated continuous current capacity.
  • 277V AC voltage rating for applications.
  • Magnetic hydraulic delay trip mechanism.
  • Single-pole breaker for single-phase circuits.
  • Lever actuator for manual control.

AA1-B0-54-620-121-D Applications

  • Branch circuit protection in panelboards.
  • Motor starter protection for industrial equipment.
  • Overcurrent protection for lighting circuits.
  • Protection for HVAC control systems.

AA1-B0-54-620-121-D FAQs

7 frequently asked questions generated from this part’s specifications.
What is the current rating of the AA1-B0-54-620-121-D?

The current rating is 20A.

What is the voltage rating?

The voltage rating is 277V.

How many poles does it have?

It has 1 pole.

What type of actuator does it use?

It uses a lever actuator.

What is the mounting type?

Panel mount.

What approvals does it have?

Approved by C, CSA, UL, and VDE.

What is the breaker type?

Magnetic hydraulic delay.

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The Littelfuse Inc. BA1-B0-14-620-121-D is a single-pole, magnetic hydraulic delay circuit breaker rated for 20A and 277V. It features a panel mount design with a lever actuator.
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