Residual current circuit breaker with overcurrent protection 2P 16A C 0.03A type AC Legrand P312 (MPN 411013)

Legrand P312 is a 2-pole residual current circuit breaker with integrated overcurrent protection, rated for 16 A and featuring a C-characteristic magnetic trip. With a residual current sensitivity of 0.03 A (30 mA) and type AC detection, this device combines earth-leakage protection and short-circuit/overload interruption in a single compact unit designed for residential and light commercial electrical installations. It is intended for installation in standard DIN-rail consumer units to protect lighting circuits, socket outlets and small appliances from fault currents and overloads.

Advantages

The device provides combined residual current detection and thermal-magnetic overcurrent protection, reducing the need for separate RCD and MCB devices and saving space in the distribution board. The C-characteristic trip curve ensures reliable performance for general-purpose circuits with moderate inrush currents, and 30 mA sensitivity offers protection against earth-leakage that can cause electric shock. Construction and terminal design support quick connection and secure mounting in modular enclosures.

Suitable for

• Protection of lighting circuits in homes and apartments
• Protection of socket outlets and general-purpose circuits
• Small office and light commercial electrical circuits
• Circuits supplying small motors or appliances with moderate inrush currents

Key specifications

• Poles: 2-pole device for phase and neutral disconnection
• Rated current: 16 A
• Tripping characteristic: C-type magnetic curve for short-circuit protection
• Residual current sensitivity: 0.03 A (30 mA), type AC
• Combined functionality: residual current device with integrated thermal-magnetic overcurrent protection
• Mounting: DIN-rail compatible modular housing for consumer units

How to use

Install the unit in a suitable distribution board on a standard DIN rail, following local electrical codes and safety practices. Connect the incoming phase and neutral conductors to the device terminals and route the downstream circuit conductors to the load terminals. Ensure correct tightening of terminal screws and that the device is mounted in the correct orientation. After wiring, test the residual current function using a suitable RCD tester or the device test button where available, and verify correct operation of the upstream supply and downstream circuits before putting into regular service.

Usage recommendations

Use this combined RCD+MCB for general-purpose circuit protection where 30 mA residual current sensitivity is required. Avoid using it on circuits with known high-frequency or smooth DC leakage currents that may not be detected by type AC devices; in such cases consider a type A or type B residual current device as appropriate. Periodically test the device according to local regulations and replace if it fails to trip during tests or shows signs of damage.