Residual Current Relay ETI KZS 2 M C 25 A - 25 A, Type C, 2-pole

ETI KZS 2 M C 25 A is a residual current relay designed to detect earth leakage currents and trigger disconnection to reduce risk of electric shock and fire. The device is rated for 25 A continuous current, uses a Type C tripping characteristic and features a 2-pole configuration appropriate for single-phase circuits with protective earth monitoring. It is intended for installation in consumer units or distribution boards where residual current detection complements overcurrent protection.

Advantages

The relay provides continuous monitoring of leakage currents with a compact 2-pole form factor suitable for standard DIN-rail mounting. Its Type C characteristic enables reliable operation with common inductive loads and typical domestic or light commercial equipment. Being rated at 25 A, the unit integrates with circuits of matching current capacity to add a layer of protection without requiring oversized conductors or enclosures.

Suitable for

• Residential electrical distribution boards (single-phase circuits)
• Light commercial installations where earth leakage protection is required
• Protection of lighting circuits, socket circuits and small appliances up to 25 A
• Retrofitting into existing consumer units that accept 2-pole residual current devices

When it may not be suitable

This relay is not intended for three-phase systems or for circuits that require a 4-pole residual device. It is also not suitable where higher continuous current ratings than 25 A are required or where specific residual current sensitivity values (e.g., for medical or industrial safety) are mandated unless matched with appropriate system design.

Key specifications

• Rated continuous current: 25 A
• Poles: 2-pole configuration
• Tripping characteristic: Type C (suitable for typical inductive loads)
• Function: Residual current (earth leakage) detection and disconnection
• Mounting: DIN-rail compatible form factor for distribution boards

How to use

Install the ETI KZS 2 M C 25 A in the distribution board on a standard DIN-rail following local electrical regulations. Connect the line and neutral conductors through the device as indicated by the manufacturer, ensuring correct orientation and secure terminations. Coordinate the residual current relay with upstream overcurrent protection and verify compatibility with the circuit load. Perform commissioning tests to confirm correct trip behavior for leakage currents and document settings and test results in accordance with safety procedures.

What to consider before purchase

• Verify that your circuit is single-phase and that a 2-pole device is appropriate
• Confirm that 25 A rated continuous current matches the protected circuit load
• Ensure Type C tripping characteristic is suitable for connected equipment (inductive loads)
• Check physical space and DIN-rail compatibility in your consumer unit or panel

Usage recommendations

Test residual current protection regularly after installation and after any significant changes to the electrical installation. Coordinate the relay with upstream protection devices and follow local wiring codes for safe operation.