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Three-pole Thermal Overload Relays Three-pole thermal overload relays designed to protect ac circuits against overloads, phase failure, long starting times and prolonged stalling of the motor. Adjustable relay setting dial Test button Stop button Manual/auto reset Trip indicator Sealable cover 1N/O & 1N/C auxiliary contacts Direct mounting beneath three-pole contactors or independent mounting on DIN rail Insulation voltage 600V, Withstand Voltage 6kV Dimensions when mounted on an ac contactor Contactor Rating(kW) H (mm) W (mm) D (mm) 4 - 9 123 45 86 11 - 18.5 137 45 92 22 - 37 175 75 123 45 178 85 129 59 - 80 267 120 136 Dimensions when mounted on a dc contactor Contactor Rating (kW) H (mm) W (mm) D (mm) 4 - 9 123 45 95 11 - 18.5 137 45 101 Approvals UL and CSA Technical note for Thermal Overload Relay, 0.25 → 0.4 A, 400 mA When a thermal overload relay is situated in the motor line of standard Star-Delta arrangement i.e. in series with the cables which lead to the motor. The overload rating is calculated by 0.58 x Motor Rating Current. Overload
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