Monitoring relay, can be attached to 3RT2 contactors, size S2 standard, digitally adjustable Apparent/active current monitoring 8...80 A, 20...400 Hz, 3-phase Supply 24 V AC/DC 1 changeover contact, 1 semiconductor output for alarm and warning Monitoring for current over- and undershoot Phase failure, wire break Phase sequence Fault current Blocking current Warning and alarm thresholds with or without fault memory Start-up delay 0-99 s Surge peak suppression 0-30 s Pause after fault 0-300 min Spring-loaded technology SIRIUS 3RR2 monitoring relay for connection to SIRIUS 3RT2 contactors or for stand-alone installation for multi-phase current monitoring of the entire system or the driven process. Reliable monitoring for cable breakage, phase failure, phase sequence, residual current, motor blockage and much more increases system availability. Actual value displays, status messages and clear error messages enable fast and reliable diagnosis. Control connection via IO-Link is also possible. You also save costs because only one device is required to monitor a motor along the entire torque curve and no separate current transformers are required. Direct installation on the 3RT2 contactors means there is no additional wiring work in the main circuit. You also benefit from the wide-voltage power supplies for worldwide use. Analogue adjustable, 2-phase variants and digitally adjustable, 3-phase variants (with and without IO-Link) are available, each in three sizes with different current measuring ranges, with two different supply voltages and two connection types. Suitable supports are available for individual installation of the 3RR2 monitoring relays. SIRIUS relays - a program for all cases.
| Property | Value |
| Max. permissible response delay time: | 99 s |
| Max. permissible release delay time: | 30 s |
| Width: | 55 mm |
| Height: | 99 mm |
| Depth: | 112 mm |
| 1-phase undercurrent possible: | no |
| 3-phase undercurrent possible: | yes |
| 1-phase overcurrent possible: | no |
| 3-phase overcurrent possible: | yes |
| 1-phase window possible: | no |
| 3-phase window possible: | no |
| Includes DC voltage undercurrent function: | no |
| Includes DC voltage overcurrent function: | no |
| DC window function: | no |
| Current measuring range: | 8 to 80 A |
| Rated control supply voltage Us at AC 50 Hz: | 24 V |
| Rated control supply voltage Us at AC 60 Hz: | 24 V |
| Rated control supply voltage Us at DC: | 24 V |
| External current transformer: | no |
