Class 10E Solid-State Overload — What the Ratings Mean for Motor Protection
The 3RB3036-1UB0 is a SIRIUS solid-state overload relay with a Class 10E trip class, meaning it will trip within 10 seconds at 7.2× the current setting — standard for protecting standard squirrel-cage motors during start-up where the acceleration time stays under 10 seconds. Rated thermal current Ith is 50 A at both 480 V and 600 V, so the same unit covers 480 V and 600 V motor branches without derating the continuous current. The maximum rated operational voltage is 690 V at AC-3e duty, which covers 400 V and 690 V line-to-line systems common in European and export panels.
Auxiliary Contact Ratings — Sizing the Control Circuit
The integrated auxiliary switch is rated 2 A at 24 V, 4 A at 120 V, and 3 A at 230 V — these are the contact ratings for the 'tripped' signaling circuit, not the main power path. At 60 V the contact is rated 0.55 A, at 110 V it is 0.3 A, at 125 V it is 0.3 A, and at 220 V it is 0.11 A — the DC ratings drop significantly with voltage, so confirm the control voltage type before wiring.
Mounting and Panel Fit — Contactor-Mount Size S2
Size S2 overload relay, 55 mm wide × 99 mm high × 104 mm deep, designed for direct contactor mounting — it fastens onto the contactor without extra DIN-rail space, keeping the panel layout tight. Mounting position is any orientation, which simplifies installation in crowded enclosures where vertical or horizontal mounting is the only option. Main circuit terminals accept solid 1×(0.5…4 mm²) or 2×(0.5…2.5 mm²), and stranded up to 2×(10…35 mm²) or 1×50 mm² — the screw-type terminals use a Pozidriv PZ 2 driver with a 5 to 6 mm shaft diameter.
Environmental and Mechanical Ruggedness
Operating temperature range is -25 to +60 °C with temperature compensation across the same span, so the trip curve stays accurate in hot panel ambient without manual adjustment. Shock resistance is 15 g / 11 ms per IEC 60068-2-27, though the signaling contact in the 'tripped' position is rated 8 g / 11 ms — the main relay body handles higher shock than the auxiliary contact when actuated. Vibration resistance covers 1–6 Hz at 15 mm amplitude and 6–500 Hz at 20 m/s² over 10 cycles — suitable for mounting on contactors driving pumps and compressors in industrial environments. Storage and transport temperature range is -40 to +80 °C, so the relay can sit in unheated warehouses or shipping containers without damage.
Lifecycle and Sourcing — Active Production, No Obsolescence Worry
The substance prohibitance date of October 15, 2014 confirms RoHS and REACH compliance — this part meets EU substance restrictions for current production. Sourced to order through independent distribution channels; availability and current pricing confirmed at RFQ against your BOM quantity.