What it is and what it does
The Siemens 3RT1016-1JB41-ZW96 is a SIRIUS power contactor in frame size S00, designed for switching motor loads and resistive loads in control panels. It carries a 24 VDC coil with an integrated diode for surge suppression, drawing 2.3 W on both closing and holding. Rated for AC-3 duty at 4.5 kW on 400 V, it handles the inductive break of a standard three-phase squirrel-cage motor. The same contactor covers AC-2 at 4 kW and AC-4 at 8.5 A at 400 V, so it fits slip-ring motors or plugging/inching applications as well.
Mounting and panel fit
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022, and side-by-side mounting is permitted with 6 mm clearance to adjacent devices. The S00 footprint — 45 mm wide, 57.5 mm tall, 72 mm deep — is the standard compact size for this current class, so it drops into existing S00 layouts without re-drilling. Main circuit screw terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or a single 4 mm² conductor — AWG equivalents 20–16, 18–14, and 12. The IP20 finger-safe enclosure on the front and terminals means it is suitable for enclosed panel use but not for washdown or outdoor exposure.
Coil and control circuit
The 24 VDC coil includes a built-in diode for surge suppression, which means no external flyback diode is needed across the coil terminals — saves a component and a wiring step. The 2.3 W holding power stays low, so the PLC output or relay driving it does not need a high-current rated contact. Auxiliary contact ratings cover the control voltage range: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V DC. One instantaneous normally-open auxiliary contact is included on the base unit.
Short-circuit protection and coordination
For Type 2 coordination (no damage to the contactor after a short circuit), the required upstream fuse is gL/gG 20 A. For Type 1 coordination (contactor may need replacement after a fault), the fuse can be 35 A. This gives the panel builder a clear choice: tighter protection vs. higher fault tolerance.