BG Bi-Directional MCB B Curve Single Pole 32A CUMB32

BG CUMB32 — 32A B Curve Single-Pole Bidirectional MCB (6kA, 1 Module)

The BG CUMB32 is a 32A B-curve, single-pole bidirectional MCB designed to deliver reliable overload and short-circuit protection for medium-load domestic and light-commercial circuits. Its bidirectional operation ensures the device trips safely even when current may flow in either direction—ideal for installations with solar PV, battery storage or other back-feed capable systems.

Featuring a compact 17.85mm single-module width, the CUMB32 installs quickly into all BG consumer units and standard 35mm DIN-rail enclosures.

Reliable Protection for Everyday & Medium-Load Circuits

The B-curve tripping characteristic provides fast disconnection on low-inrush circuits, helping prevent damage to wiring and connected equipment. With a 6kA breaking capacity, the CUMB32 offers secure short-circuit protection suitable for a wide range of applications, including:

General-purpose radial circuits

Small appliance radials

Utility circuits

Light commercial loads

Designed for easy installation and dependable long-term performance, the CUMB32 includes:

Positive contact status indication

PZ2 screw terminals for firm, reliable terminations

Up to 25mm² terminal capacity (for 32–55A models)

–25°C to +40°C operating temperature range

4,000 electrical and 10,000 mechanical endurance cycles

This makes it a robust choice for both residential contractors and small-scale commercial installers.

Key Features of the BG Bi-Directional MCB 32A Include:

• 32A B-Curve Single-Pole Bidirectional MCB
• Suitable for PV, Battery Storage & Back-Feed Applications
• 6kA Breaking Capacity for Reliable Fault Protection
• Compact 1-Module (17.85mm) DIN-Rail Design
• Positive Contact Status Indicator
• PZ2 Screw Terminals with Up to 25mm² Cable Capacity
• Operating Temperature Range: -25°C to +40°C
• Durable Mechanism: 4,000 Electrical & 10,000 Mechanical Operations
• Complies with IEC/EN 60898 Standards

View all BG MCBs

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