Products Description

The M5 screw terminal purpose-built for C4 circuit breakers is a premium cage-style electrical connection component, developed as a high-value replacement for costly, oversized traditional brass terminals. It serves as the critical conductive interface that electrically links a circuit breaker to the downstream circuit it protects. End users can connect both bare wires and wires fitted with end connectors securely to the circuit breaker via this terminal, creating a stable, low-resistance electrical path within equipment assemblies.

Core Advantages & Industry Applications

This cage terminal design delivers four key benefits for electrical equipment manufacturers: compact footprint, reduced material cost, simplified on-device assembly, and flexible mounting compatibility. Thanks to these practical strengths, it has become a widely adopted connection solution across the low-voltage electrical sector.

It is most commonly integrated into:

C4 and other miniature circuit breakers

Electric control switches and relay units

Residual current devices (RCDs) / leakage protection switches

Various enclosed electrical control devices

Terminal Design & Available Configurations

Screw termination systems create secure, torque-controlled connections by tightening dedicated screws to clamp connecting conductors - including solid/stranded wires, fork or ring connectors, and bus bars - firmly to the circuit breaker body. Each standard M5 screw terminal assembly consists of a precision-threaded terminal base paired with industry-standard 8-32 or 10-32 screws for consistent, repeatable installation.

We supply two primary screw terminal styles to match different wiring setups:

1.Bus Type Screw Terminals This style is engineered for a completely flush, low-profile connection when bus bars are used as the main conductor. The terminal is oriented to align perfectly with horizontally mounted bus bars when paired with a vertically installed circuit breaker, creating a neat, space-efficient bus connection.

2.Screw Terminals with Upturned Lugs This variant features slightly upward-bent edges on the bus terminal section. The upturned lip creates a guided, more secure seating position for fork or ring connectors, minimizing the risk of connector slippage during assembly or operation. For custom enclosure layouts, select versions of this terminal can also be fabricated with a 30-degree bent angle.

product-1807-870

Terminal Selection Guidance

Selecting the correct circuit breaker terminal is essential for safe, code-compliant electrical performance. The optimal terminal choice depends primarily on four factors: the current rating of the matched circuit breaker, applicable regional regulatory requirements, the gauge of the connecting wire, and the type of conductor connector used.

As a fundamental safety check during specification, always confirm that the current ratings of the wire, connector, and terminal are all rated to safely carry the maximum rated current of the circuit breaker. Mismatched current capacity can cause overheating, degraded conductivity, and potential equipment failure.