Equivalent & Substitute Parts for 1B3UM Circuit Breaker

Part Overview

The 1B3UM is a thermal magnetic circuit breaker manufactured by Altech Corporation, rated for 3A current with 480 V AC and 42 V DC voltage ratings. This single-pole DIN rail-mounted breaker features lever actuation and is part of the V-EA series. The product is active and widely stocked (967 units in inventory), making it a standard component for industrial electrical distribution and protection applications.

Substitute parts are identified when equivalent electrical and mechanical parameters allow direct replacement without compromising circuit protection or system compatibility.

Substiute Parts

1B3UM

Altech CorporationIn Stock: 10441B3UM Datasheet

Current PartRFQ

1C3UM

Altech CorporationIn Stock: 11731C3UM Datasheet

Parametric EquivalentRFQ

1G3UM

Altech CorporationIn Stock: 9131G3UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1B3UM is determined by strict equivalence across the following critical parameters:

• Breaker Type: Thermal Magnetic (identical protection mechanism required)
• Current Rating: 3A (exact amperage match for circuit protection integrity)
• Number of Poles: 1 (single-pole configuration)
• Mounting Type: DIN Rail (physical form factor compatibility)
• Actuator Type: Lever (operational interface consistency)
• Series: V-EA (product family compatibility)
• Voltage Ratings: AC and DC voltage ratings must support the application

Two substitute parts meet these criteria: 1C3UM and 1G3UM. Both are Altech Corporation thermal magnetic 3A single-pole lever-actuated DIN rail breakers within the V-EA series. The 1C3UM maintains identical voltage ratings (480 V AC / 42 V DC) as the 1B3UM. The 1G3UM differs in AC voltage rating (277 V AC instead of 480 V AC) and is suitable only for applications operating at 277 V AC.

Parameter Comparison

Engineering Selection Recommendations

1C3UM as Primary Substitute: The 1C3UM is a direct parametric equivalent to the 1B3UM, matching all electrical specifications (480 V AC / 42 V DC, 3A) and mechanical form factors. Both parts carry CSA and UL508 certifications, with 1C3UM additionally holding VDE approval. Inventory availability is higher for 1C3UM (1162 units), supporting supply chain continuity. This part is suitable for direct replacement in any application currently using 1B3UM.

1G3UM as Voltage-Specific Substitute: The 1G3UM is suitable only for applications operating at 277 V AC (not 480 V AC). While it maintains identical current rating (3A), pole configuration, and mechanical mounting, the reduced AC voltage rating restricts its use to lower-voltage distribution systems. Selection of 1G3UM requires confirmation that the application operates at 277 V AC. Both 1B3UM and 1G3UM carry identical CSA and UL508 certifications.

All three parts are active products with ROHS3 compliance and REACH unaffected status, confirming regulatory alignment for current procurement.

Frequently Asked Questions (FAQ)

Q: Can 1C3UM replace 1B3UM in any application? A: Yes. The 1C3UM is a parametric equivalent with identical current rating (3A), voltage ratings (480 V AC / 42 V DC), pole configuration (1-pole), mounting type (DIN Rail), and actuator type (Lever). Both are thermal magnetic breakers within the V-EA series with equivalent certifications.

Q: When is 1G3UM appropriate as a substitute? A: The 1G3UM is appropriate only for applications operating at 277 V AC. It is not suitable for 480 V AC systems. Verify the system voltage before selecting 1G3UM.

Q: What is the difference between 1B3UM and 1C3UM? A: The primary difference is approval agency coverage. 1C3UM carries an additional VDE certification beyond the CSA and UL508 certifications held by 1B3UM. Electrical and mechanical parameters are identical.

Q: Are all three parts DIN rail compatible? A: Yes. All three parts (1B3UM, 1C3UM, 1G3UM) are single-pole DIN rail-mounted breakers with lever actuation, ensuring mechanical compatibility within DIN rail enclosures.

Q: What certifications apply to these breakers? A: 1B3UM and 1G3UM carry CSA and UL508 certifications. 1C3UM carries CSA, UL508, and VDE certifications. All three are ROHS3 compliant and REACH unaffected.

Q: Is packaging identical across all three parts? A: All three parts are supplied in bulk packaging as standard.