This is a Siemens SIRIUS 3RB3113-4PB0 solid-state overload relay, size S00, meant to mount directly onto a contactor for motor protection. The adjustable trip class (5E, 10E, 20E, 30E) lets you match the overload curve to the motor-start profile without swapping parts — keeps a single SKU on the shelf for a range of starting conditions. Rated thermal current 4 A at 690 V. Minimum pickup is lower current setting; maximum is 3.5× the upper setting. Size S00 means a 45 mm wide body, 73 mm deep, 79 mm high — fits in the same footprint as other S00 contactor-mount overloads. The screw terminals accept 1x 0.5...4 mm² or 2x 0.5...2.5 mm² solid/stranded, with a Pozidriv PZ2 screwdriver tip. Mount in any position; vibration rated 1-6 Hz at 15 mm, 6-500 Hz at 20 m/s², shock 15 g/11 ms.
Designed for contactor mounting — no separate base required. The screw terminals are flagged for main current circuit use; auxiliary contacts (signaling contact 97/98) trip to indicate overload. Wire up using the screwdriver shaft diameter 5-6 mm, strip length per terminal spec. Storage temp -40...+80 °C, operating -25...+60 °C with temperature compensation. RoHS compliant per substance prohibition date 2009-10-01. The solid-state design gives better repeatability than bimetallic relays and no mechanical wear from cycling.