Residual Current Circuit Breaker Schneider Electric A9D20616 2P 16 A 30 mA Type AC with Overcurrent Protection

Schneider Electric A9D20616 is a 2-pole residual current circuit breaker with integrated overcurrent protection rated at 16 A and 30 mA sensitivity (Type AC). Designed for residential and light-commercial electrical installations, this device combines earth-fault detection with short-circuit and overload interruption in a single compact module, allowing reliable disconnection of fault currents and reducing the risk of electric shock and fire.

Advantages

The device integrates residual current detection and thermal-magnetic overcurrent protection into one unit, saving panel space and simplifying wiring. With 30 mA sensitivity it provides personnel protection against indirect contact, while the thermal-magnetic trip ensures protection against overloads and short circuits. The Type AC detection responds to sinusoidal alternating leakage currents, and the two-pole configuration enables simultaneous isolation of both poles for safer maintenance and clearer fault indication.

Suitable for (tasks / use cases)

• Protection of circuits in domestic electrical panels, including lighting and socket circuits
• Small offices and light-commercial premises requiring combined earth-fault and overcurrent protection
• Upgrades or retrofits where replacing separate RCD and MCB with a combined device saves space
• Circuits feeding appliances and equipment with standard AC leakage characteristics

When it may not be suitable

This Type AC residual current device is designed to detect sinusoidal alternating leakage currents; it may not detect pulsating DC or complex leakage waveforms produced by certain electronic appliances or frequency converters. For installations with significant electronic equipment or where selective discrimination with upstream devices is required, a different RCD type or coordination strategy may be preferable. Also, the 16 A rating limits use to circuits within that current capacity.

Key specifications

• Poles: 2-pole device providing simultaneous disconnection of both poles
• Rated operating current: 16 A
• Residual current sensitivity: 30 mA (Type AC)
• Protection functions: combined earth-fault (residual current) and thermal-magnetic overcurrent protection
• Trip characteristics: thermal element for overloads and magnetic element for short-circuit interruption
• Mounting: DIN-rail compatible modular housing for installation in distribution boards

How to use

Install the device in the electrical distribution board on a standard DIN rail, following local wiring regulations. Connect the incoming supply and outgoing load conductors to the labeled terminals, ensuring correct polarity and secure torque on terminal screws. Test the residual current function after commissioning using the built-in test button and periodic testing thereafter according to local standards. Ensure protective coordination with upstream and downstream devices and replace the unit if it shows signs of damage or failure.

What to consider before purchase

• Verify circuit current requirements to ensure 16 A is appropriate for the intended load
• Confirm that Type AC sensitivity is suitable for the types of connected equipment and leakage characteristics
• Check available space in the distribution board for a 2-pole modular device and DIN-rail compatibility
• Ensure required coordination with other protective devices in the installation

Usage recommendations

Regularly test the residual current function using the test button and schedule periodic inspections. Use this device as part of a coordinated protection scheme and replace it with an appropriate RCD type if connected equipment produces non-sinusoidal leakage currents. Follow Schneider Electric installation guidelines and local electrical codes during installation and maintenance.