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Thermal overload relay. 9.0012.0 A / 5.00 kW. 9004840541922. LSTD1200. *Reference values for 4-pole standard motors at 50 Hz/400 VAC. The selection Where a motor is derated, selection of overload relay should take into account the derating factor. Short Circuit Protective Devices (SCPD). The current trends On the front face of the overload relay: b selection of reset mode: Manual (marked H) or Automatic (marked A), b red pushbutton: Trip Test function,. Overload Relay Heater Tables. Selection of Heater Elements for Overload Relays. General. Formula—Approximate Full Load Amps for Other Motors. 3RB22/23 overload relays up to 820 A for full motor protection, CLASS 5 to. CLASS 30 adjustable. Page. Selection and ordering data. • Basic Unit.Higher ratings of Contactors can be used in place of recommended combinations. ○ Selection is for Normal Starting time (Relay Trip classes 10A/10). ○ For high 3-pole relays with screw clamp terminals. These overload relays are designed for the protection of motors. They are compensated and phase failure sensitive. When selecting the overload relay, check suitability on the basis of the tripping curves. The values for the ratio of pick-up current Ia to rated current In and