SIRIUS 3RU2116-0FC0-ZX95 — Thermal Overload Relay, Size S00
The Siemens 3RU2116-0FC0-ZX95 is a SIRIUS thermal overload relay, size S00, designed for motor protection in control panels. It mounts directly onto a contactor (fastening method: contactor mounting) and provides Class 10 trip protection — meaning it will trip within 10 seconds at 7.2× the set current, appropriate for standard induction motor starts where the start-up transient is brief. Rated insulation voltage is 690 V, with AC-3e maximum operating voltage also 690 V. The relay is temperature-compensated from -40 to +60 °C, so the trip curve stays consistent across a wide ambient range — important for panels near process heat or in unheated enclosures. The auxiliary switch is integrated (no separate block needed) and carries the following contact ratings: 2 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V, and 0.22 A at 125 V / 110 V / 220 V. These are the contacts that signal the "Tripped" message back to the PLC or annunciator.
Mounting and Wiring
Mounts in any position directly onto the contactor — no DIN rail required for the relay itself, though the contactor typically clips onto a DIN rail. The main current circuit uses spring-loaded terminals (cage clamp) accepting 2× (0.5 to 2.5 mm²) solid or stranded wire. Screwdriver shaft diameter 3 mm, tip 3.0 × 0.5 mm for the auxiliary terminals. Dimensions: 70 mm deep, 45 mm wide, 87 mm high. This is the S00 form factor — the smallest SIRIUS overload relay size, fitting contactors in the S00 frame class.
Motor Power and Current Ratings
Motor power ratings at 50/60 Hz: 0.12 kW at 400 V, 0.18 kW at 500 V, 0.25 kW at 690 V. Current ratings at 480 V and 600 V are both 0.5 A. These are the motor-protection settings the relay is designed to match. Per-pole power dissipation is 1.6 W — factor this into enclosure thermal calculations if the relay is in a sealed cabinet with other heat sources.
Lifecycle and Compliance
Substance prohibitance date is 10/01/2009, indicating RoHS compliance (EU RoHS, likely with exemptions as applicable). Operating temperature range -40 to +70 °C; storage and transport range -55 to +80 °C. MTTF with high demand rate is 2,280 years — a reliability figure used for safety-instrumented-system calculations.