Siemens Monitoring Relay, 3 Phase, SPDT, 250V ac

This monitoring relay is a phase-sequence detector designed for AC systems, operating from a nominal 250V AC supply to supervise rotation direction and sequence. It provides a single changeover contact to signal correct phase order and is intended for panel or DIN-rail integration in industrial control environments. The device features a transparent cap for visible status indication and is rated for use within typical industrial ambient conditions.

• 250V AC supply ensures compatibility with mains control circuits
• SPDT contact configuration delivers a single switching output
• 4A rated switching current supports moderate control loads
• 10V minimum switching voltage allows low-voltage signalling
• Operating range factor 0.8 to 1.1 accommodates voltage variations

• Suitable for detecting motor rotation direction in motor controls
• Ideal for phase-sequence verification in distribution panels
• Used with control systems requiring single-contact status signalling
• Can be used for monitoring three-phase supply sequencing

It uses one single-pole double-throw contact to change state on correct phase sequence.

It operates between -20°C and 60°C ambient temperature.

Terminals use cross-head screw connections accepting up to 2 x 2.5mm² rigid conductors.

The unit has an IP20 rating when conductors are connected and is protection class II.