Circuit Breaker 3B4UM Equivalent & Substitute Parts

Part Overview

The Altech Corporation 3B4UM is a thermal magnetic circuit breaker rated for 4A at 480V AC / 80V DC with lever actuation and three poles, designed for DIN rail mounting. This component is currently active in production with 691 units in stock. Circuit breakers of this specification are essential in electrical distribution systems for overcurrent protection and load switching. Substitute parts become necessary when the primary model experiences supply constraints, extended lead times, or when system design requires alternative thermal-magnetic characteristics within the same electrical and mechanical envelope.

Substiute Parts

3B4UM

Altech CorporationIn Stock: 7993B4UM Datasheet

Current PartRFQ

3D4UM

Altech CorporationIn Stock: 7293D4UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3B4UM has one parametric equivalent substitute: the 3D4UM. Substitution eligibility is determined by strict equivalence across the following critical parameters:

• Current Rating: 4A (identical)
• Voltage Rating - AC: 480V (identical)
• Voltage Rating - DC: 80V (identical)
• Number of Poles: 3 (identical)
• Breaker Type: Thermal Magnetic (identical)
• Mounting Type: DIN Rail (identical)
• Actuator Type: Lever (identical)
• Series: V-EA (identical)
• RoHS Status: ROHS3 Compliant (identical)

The 3D4UM differs only in its thermal-magnetic trip characteristic designation (D Char vs. B Char) and carries additional VDE approval certification. Both parts maintain identical electrical ratings, mechanical form factor, and regulatory compliance for core applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 3B4UM and 3D4UM are active production components with full regulatory compliance. The 3B4UM carries CSA and UL508 certifications, while the 3D4UM adds VDE certification. Selection between these parts should be based on:

• Geographic regulatory requirements: VDE certification may be required for European market applications
• Thermal-magnetic trip characteristic requirements: B Char (3B4UM) versus D Char (3D4UM) specifications must align with system protection coordination curves
• Supply availability: Both parts maintain adequate inventory levels

Both parts are ROHS3 compliant and carry identical electrical and mechanical specifications for DIN rail mounting applications.

Frequently Asked Questions (FAQ)

Q: Can the 3D4UM directly replace the 3B4UM in existing installations?

A: Direct replacement is possible only if the thermal-magnetic trip characteristic (D Char vs. B Char) is compatible with the system's protection coordination requirements. Electrical ratings and mechanical form factors are identical.

Q: What is the difference between B Char and D Char thermal-magnetic characteristics?

A: The trip characteristic designation indicates the thermal and magnetic response curve of the breaker. This parameter is provided in the input data; specific curve details must be obtained from manufacturer technical documentation.

Q: Are both parts suitable for North American applications?

A: Yes. Both the 3B4UM and 3D4UM carry CSA and UL508 certifications required for North American markets. The 3D4UM includes additional VDE certification for European compliance.

Q: What is the DIN rail mounting specification?

A: Both parts are designed for standard DIN rail mounting with lever actuation. Mechanical compatibility is identical between the two models.

Q: Are there any RoHS or environmental compliance differences?

A: Both parts are ROHS3 compliant and REACH unaffected. Environmental and hazardous substance compliance is equivalent.