Circuit Breaker 3B63UM Equivalent & Substitute Parts

Part Overview

The Altech Corporation 3B63UM is a thermal magnetic circuit breaker rated for 63A at 480V AC and 60V DC, designed for DIN rail mounting with lever actuation. This three-pole breaker is UL508 approved and maintains active product status with ROHS3 compliance. Substitute parts are identified based on matching electrical ratings, mechanical mounting specifications, and approval certifications to ensure direct functional equivalence in circuit protection applications.

Substiute Parts

3B63UM

Altech CorporationIn Stock: 11773B63UM Datasheet

Current PartRFQ

3G63UM

Altech CorporationIn Stock: 8733G63UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3G63UM qualifies as a parametric equivalent to the 3B63UM based on identical electrical and mechanical specifications. Both parts share the same current rating (63A), voltage ratings (480V AC / 60V DC), thermal magnetic protection type, three-pole configuration, DIN rail mounting, and lever actuation. Both are UL508 approved and belong to the V-EA series. The substitution is valid where the B-characteristic and G-characteristic thermal trip curves are functionally interchangeable for the application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the 3B63UM and 3G63UM are active products with identical electrical specifications and UL508 certification. Selection between these parts depends on thermal characteristic curve requirements specific to the application. The B-characteristic (3B63UM) and G-characteristic (3G63UM) designations indicate different thermal trip response profiles. Component selection must align with circuit protection coordination requirements and load characteristics. Both parts maintain ROHS3 compliance and REACH unaffected status for regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 3G63UM directly replace the 3B63UM in existing installations? A: Direct replacement is possible when the thermal characteristic curve difference between B and G types does not affect circuit protection coordination. Verify that the application does not depend on the specific thermal response of the original B-characteristic breaker.

Q: Are there any mechanical compatibility issues between these parts? A: No. Both parts share identical DIN rail mounting specifications, lever actuation, and three-pole configuration. Physical installation and electrical connections are identical.

Q: Do both parts meet the same regulatory standards? A: Yes. Both the 3B63UM and 3G63UM carry UL508 approval, ROHS3 compliance, and REACH unaffected status.

Q: What is the difference between B-characteristic and G-characteristic designations? A: The characteristic letter indicates the thermal trip curve response. B and G types have different thermal response profiles for circuit protection. Selection depends on application-specific load and coordination requirements.

Q: Are packaging and inventory considerations relevant to substitution? A: Packaging is identical (Bulk) for both parts. Inventory availability may influence procurement decisions but does not affect technical substitutability.