The AC-3 4 kW/400 V rating is the key selection parameter: it tells you this relay can handle a 4 kW motor load under IEC 60947-4-1 utilization category AC-3, which covers starting and plugging/plug-stop of cage motors. If your motor is larger than 4 kW, you need a larger frame (S0, S2, etc.) or a higher-rated variant. The DC 24 V coil with 0.7...1.25×US means the relay picks up reliably even when the control voltage sags to 16.8 VDC and stays pulled in up to 30 VDC — useful on long cable runs or shared power supplies. Size S00 is the smallest SIRIUS contactor frame (45 mm width), so it fits in tight panel layouts and on standard DIN rails. The single NC contact is factory-fitted; if your application needs more auxiliary contacts, you'll add a side-mount auxiliary contact block from the same SIRIUS family.
Siemens 3RT1016-1HB42-ZW98 Coupling Relay, AC-3 4 kW/400 V,
MPN3RT1016-1HB42-ZW98
Siemens SIRIUS 3RT1016-1HB42-ZW98 coupling relay, AC-3 4 kW/400 V, 1 NC, DC 24 V, 0.7...1.25×US, 3-pole, size S00, screw connection, multi-unit packing.
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Independent China distributor & sourcing agent· Listing updated Sep 2026
Product details
Frequently asked questions
What is the AC-3 motor rating of this coupling relay?
It is rated for AC-3 duty at 4 kW on a 400 V three-phase supply, which covers direct-on-line starting of motors up to that power level.
What coil voltage does this relay use?
The coil is DC 24 V with a tolerance range of 0.7 to 1.25 times the rated voltage, so it operates from about 16.8 VDC to 30 VDC.
What frame size is this relay?
It is size S00, the smallest SIRIUS contactor frame at 45 mm width, designed for DIN-rail mounting in control panels.
MPN
3RT1016-1HB42-ZW98