SIRIUS 3RV1 motor starter protectors/circuit breakers with mountable accessories SIRIUS 3RB3133-4.B0 electronic overload relays The 3RB30/3RB31 electronic overload relays up to 115 A with internal power supply have been designed for current-dependent protection of loads with normal and heavy starting, "function" against excessive temperature rises due to overload, phase unbalance or phase failure. An overload, phase unbalance or phase failure result in an increase of the motor current beyond the set rated motor current. This rise in current is detected by the current transformers integrated into the devices and evaluated by corresponding solid-state circuits which then output a pulse to the auxiliary contacts. The auxiliary contacts then switch off the load by means of a contactor. The break time depends on the ratio between the tripping current and the current setting Ie and is stored in the form of a long-term stable tripping characteristic curve, In addition to inverse-time delayed protection of loads against excessive temperature rises due to overload, phase unbalance and phase failure, the 3RB31 electronic overload relays also allow internal ground-fault detection (not possible in conjunction with contactor assemblies for wye-delta starting). This provides protection of loads against high-resistance short circuits due to damage to the insulation material, moisture, condensed water etc. The "tripped" status is signaled by means of a switch position indicator. The relay is reset manually or automatically after the recovery time has elapsed. The 3RB3 electronic overload relays are suitable for operation with frequency converters. The devices are manufactured in accordance with environmental guidelines and contain environmentally-friendly and reusable materials. They comply with all important worldwide standards and approvals. For 3RB20 and 3RB21 overload relays in sizes S6 to S10/S12, see "SIRIUS 3RB2 electronic overload relays". Use in hazardous areas3RB30/3RB31 electronic overload relays for IO‑Link are suitable for overload protection of motors with the following types of protection:
EC type test certificate for Group II, Category (2) G/D exists. It has the number PTB 09 ATEX 3001. Article No. scheme
Note: The Article No. scheme shows an overview of product versions for better understanding of the logic behind the article numbers. For your orders please use the article numbers quoted in the selection and ordering data. |
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