Residual current circuit breaker RH99M with automatic reset 56192

Differential relay – protection and reliability of installation

The RH99M differential relay with automatic reset is a key element ensuring safety and continuity of operation in electrical installations. The device is designed to monitor leakage currents and quickly respond to potential hazards, minimizing the risk of electric shock and equipment damage. Its construction, based on proven Schneider Electric technology, guarantees high precision and long-term reliability.

Functionality and application

The RH99M relay is intended for use in alternating current (AC) circuits. It serves to protect against the effects of short circuits to earth and overloads, making it an ideal solution for both industrial installations and public buildings or homes. Automatic reset after activation allows for quick restoration of power after removing the cause of the problem – although it is important to diagnose the source of the leakage before restarting. Thanks to the wide range of current setting (0.03 mA – 30 mA and 0…30000 mA), it can be adapted to the specifics of the protected installation. The device is powered from an AC network with a voltage of 110-130V at a frequency of 50-400 Hz.

Characteristics and benefits

• Fast response: The relay monitors the differential current in real time, providing a quick response to dangerous situations.
• Automatic reset: After eliminating the cause of the activation, the device automatically restores power, minimizing downtime in the operation of the installation.
• Wide range of settings: The ability to precisely adjust the current setting value to specific application needs.
• Solid connections: The use of screw connections ensures a stable and reliable electrical connection.
• Compact dimensions: Dimensions of 54 x 97 x 74 mm make it easy to mount in a limited space.
• Versatility: Suitable for protecting three-phase circuits, which increases its versatility.
• Safety: Compliance with standards ensures a high level of safety.

The device has one normally open and one normally closed contact, which allows integration with control systems and alarm signaling. The lack of a fault memory function means that after reset there is no information about previous events – which may be an advantage in some applications requiring simplicity of operation. The lack of a differential current indicator simplifies the device's construction and reduces its cost, while maintaining the basic functionality of electric shock protection.