Residual Current Circuit Breaker ABB FH202 AC-25/0.03 25 A 2-pole (type AC)

ABB FH202 AC-25/0.03 is a residual current circuit breaker designed to provide personal protection and additional fire prevention in low-voltage installations. The device is rated for 25 A nominal current, has a residual current sensitivity of 30 mA (0.03 A) and uses a 2-pole configuration to monitor and disconnect alternating (AC) residual currents. It is intended for mounting in distribution boards and is suitable for residential and light commercial environments where AC-type detection is required.

Advantages

The ABB FH202 AC-25/0.03 offers reliable residual-current detection for alternating currents with a compact 2-pole design that saves space in the consumer unit. With 30 mA sensitivity it balances protection against electric shock and immunity to small leakage currents, helping to reduce the risk of fire caused by ground faults. The unit is compatible with common DIN-rail distribution panels and is manufactured to industry quality standards for consistent operation.

Suitable for

• Residential distribution boards protecting circuits such as lighting and sockets
• Small commercial premises where AC residual-current detection is sufficient
• Retrofit or new installations requiring a 2-pole 25 A RCCB with 30 mA sensitivity
• Systems where space-saving two-pole protection devices are preferred

When it may not be suitable

This type AC RCCB detects only alternating residual currents and does not provide protection against pulsating DC or smooth DC faults. It may not be appropriate for installations with equipment that can generate DC leakage (for example some photovoltaic inverters, variable frequency drives, or certain battery-backed systems) where type A or type B devices are recommended. Also, if circuit currents exceed 25 A or multi-pole isolation is required, a different rated or multi-pole device should be selected.

Key specifications

• Rated current: 25 A
• Residual-current sensitivity: 30 mA (0.03 A)
• Poles: 2-pole
• Detection type: AC (alternating residual currents)
• Mounting: DIN-rail compatible for distribution boards

How to use

Install the ABB FH202 AC-25/0.03 in the appropriate position on the DIN rail inside the distribution board, following local wiring regulations and ensuring the device is accessible for operation and testing. Connect the line and neutral conductors to the designated terminals and secure all connections to the torque values recommended by the installation standards. After installation, test the RCCB using the built-in test button to verify correct operation and perform periodic testing according to regional electrical safety guidelines.

What to consider before purchase

• Verify that 25 A rated current matches the circuit load and downstream protective devices.
• Confirm that AC-type residual-current detection is suitable for connected equipment.
• Ensure distribution board space and DIN-rail compatibility for a 2-pole device.
• Check local regulations for required residual current sensitivity and device type.

Usage recommendations

Test the device after installation and at regular intervals using the test button. Where equipment may produce DC leakage or pulsating currents, choose an appropriate RCCB type. Coordinate RCCB selection with upstream and downstream protective devices to maintain selective protection and safe operation.