The 3RU2116-0KB0: CLASS 10 means the relay trips within 10 seconds at 7.2× the current setting — standard for motor protection where the starting profile is moderate (pumps, fans, compressors). The auxiliary contact ratings are given per voltage because the switching capacity is limited by arc extinction at higher voltages; at 690 V the contact is rated 0.75 A, so if your control circuit runs at that level, verify the load current stays under that limit.
Mounts directly onto the contactor via the fastening method specified — no DIN rail needed. Screw-type terminals on the main circuit accept 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²). The auxiliary switch is integrated, so no separate add-on block required. Dimensions: 45 mm wide, 76 mm high, 70 mm deep — fits standard panel layouts.
Operating temperature range -40 to +70 °C, with temperature compensation active from -40 to +60 °C — meaning the trip curve stays accurate across that span. The relay carries a substance prohibitance date of 10/01/2009, indicating RoHS compliance. MTTF with high demand rate is 2,280 years — a reliability figure for safety-related applications.