Residual current circuit breaker RH99M with automatic reset 56190

Differential relay RH99M is a reliable device designed to monitor the insulation status in electrical installations. Its main task is to detect a decrease in insulation resistance, which may indicate wear of wires or irregularities in the installation. The device works with a toroidal current transformer (available separately), measuring the leakage current and generating an alarm signal when a set threshold is exceeded.

Functionality and application

The RH99M relay finds application in mixed circuits, both in single-phase and three-phase installations. It is ideal for monitoring the insulation status in residential, commercial and industrial buildings. Automatic reset after fault removal ensures continuous system operation without the need for manual intervention. This allows installers to rely on its reliability, and end users to gain confidence in the safe operation of the installation.

Characteristics and benefits

• Wide range of current settings: The ability to adjust the trigger threshold in the range of 0.03 mA to 30 mA and 0…30000 mA allows you to adapt the device's sensitivity to the specifics of the monitored installation.
• Adjustable time delay: Setting the activation delay (from 0 s to 4.82 s) minimizes the risk of false alarms caused by short-term overvoltages or disturbances.
• Universal power supply: Operation with AC/DC voltage (12-48 V DC and 12-24 V AC) increases the flexibility of mounting and connecting the device.
• DIN rail mounting: Standard DIN rail mounting simplifies the integration of the relay with the existing electrical infrastructure in the switchgear cabinet.
• Durable construction: The housing with dimensions of 54 x 97 x 74 mm provides adequate protection against external factors (IP40 protection class).
• Status indication: It has one normally open and one normally closed contact, allowing easy connection to alarm signaling or control systems.
• Compliance with standards: The relay has been designed with safety and reliability in mind, meeting the required industry standards.

The RH99M relay is a solid solution for professionals looking for an effective way to monitor insulation status and ensure safety in electrical installations. Its versatility and ease of configuration make it an ideal choice for both installers and end users who care about the reliability of their electrical systems.