The 3RA2125-4EA27-0AP6 is a SIRIUS non-fused motor starter in the S0 frame size, built as a direct starter with a thermal bimetallic overload relay (Class 10 trip). Current ratings of 27 A at both 480 V and 600 V confirm the contactor and overload are sized for the same motor full-load current across common North American voltage levels.
Snap-on DIN rail or screw-mount — integration notes
Snap-mounted to DIN rail or screw-mounted with an additional push-in lug; mounting position is vertical only, with 30 mm clearance upward, 10 mm forward and downward, and 9 mm at the side — plan the enclosure layout around these minimums. Dimensions are 45 mm wide, 97.1 mm deep, 193.1 mm high — the S0 footprint is common across the SIRIUS 3RA2 range, so panel cutouts and busbar positions carry over if you swap between S0 starters. The unit ships with the contactor (3RT2027-1AP60) and link module (3RA2921-1AA00) pre-assembled — no field wiring between contactor and overload; just land the motor leads and control voltage.