The RM35HZ21FM is a frequency monitoring relay designed to detect and respond to fluctuations in AC network frequency. It features adjustable settings for overfrequency and underfrequency detection within a range of 50 or 60 Hz, with a response time adjustable from 0.1 to 10 seconds. The relay provides an alarm output and can monitor minimum or maximum frequency values, making it suitable for ensuring stable power system operation. It is compatible with a 1250 VA load, operates at 6 VA AC or 10 mA at 5 V DC, and is mounted on a 35mm wide panel, similar in size to a 3-pole circuit breaker.

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