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BA1-B4-12-640-521-D The Littelfuse Inc. BA1-B4-12-640-521-D is a single-pole, magnetic (hydraulic delay) circuit breaker rated for 40A and 277V. It features a lever actuator and panel mount design.
Mfr Part #:

BA1-B4-12-640-521-D

Mfr Name: Littelfuse Inc.
Littelfuse Inc.
The Littelfuse Inc. BA1-B4-12-640-521-D is a single-pole, magnetic (hydraulic delay) circuit breaker rated for 40A and 277V. It features a lever actuator and panel mount design.
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BA1-B4-12-640-521-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
Voltage Rating
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BA1-B4-12-640-521-D Description

Short technical summary and product information.

This Littelfuse Inc. BA1-B4-12-640-521-D is a single-pole circuit breaker designed for reliable circuit protection. It utilizes a magnetic (hydraulic delay) mechanism for its tripping action, offering a current rating of 40A and a voltage rating of 277V.

 

The breaker features a lever actuator for easy operation and is designed for panel mounting, making it suitable for integration into various electrical enclosures and systems. Approval agencies include CCC, CSA, UL, and VDE, indicating compliance with significant international standards.

 

Environmental compliance includes RoHS3 compliance, MSL 1, and REACH unaffected status. The part is identified by manufacturer part number BA1-B4-12-640-521-D and distributor part number 432-BA1-B4-12-640-521-D-ND.

BA1-B4-12-640-521-D Quick Information

Product Type: Circuit Breaker
Series: BA1
Canonical Name: Littelfuse Inc. BA1-B4-12-640-521-D Magnetic (Hydraulic Delay) Circuit Breaker
Subcategory: Circuit Breaker

BA1-B4-12-640-521-D Compliance

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

BA1-B4-12-640-521-D Features

  • 40A current rating for robust protection.
  • 277V voltage rating for various applications.
  • Magnetic (hydraulic delay) tripping mechanism.
  • Single-pole design for simple circuits.
  • Panel mount for easy integration.

BA1-B4-12-640-521-D Applications

  • Suitable for industrial control panels.
  • Used in power distribution systems.
  • Ideal for equipment protection circuits.
  • Applicable in commercial electrical systems.

BA1-B4-12-640-521-D FAQs

6 frequently asked questions generated from this part’s specifications.
What is the voltage rating of the BA1-B4-12-640-521-D?

277V.

What is the current rating?

40A.

What type of circuit breaker is this?

Magnetic (Hydraulic Delay) circuit breaker.

How many poles does it have?

1 pole.

What is the mounting type?

Panel mount.

What agency approvals does this circuit breaker have?

CCC, CSA, UL, VDE.

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The Littelfuse BA1-B0-14-640-512-D is a 40A, 277V, 1-pole magnetic hydraulic delay circuit breaker with lever actuator and panel mount. It is approved by CCC, CSA, UL, and VDE.
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The Littelfuse Inc. BA1-B0-14-640-521-D is a single-pole, magnetic hydraulic delay circuit breaker. It features a 40A current rating and a 277V voltage rating.
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The Littelfuse Inc. BA1-B0-10-640-521-D is a 1-pole circuit breaker designed for panel mounting. It features a 40A current rating and a 277V voltage rating.
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