3RU1146-4LB0

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SIRIUS 3RU1116‑0AB0 thermal overload relay

The 3RU11 thermal overload relays up to 100 A have been designed for inverse-time delayed protection of loads with normal starting (for "Function" see Reference Manual "Protection Equipment – 3RU1 and 3RB2 Overload Relays": https://support.industry.siemens.com/cs/ww/de/view/35681830) against excessive temperature rises due to overload or phase failure.

An overload or a phase failure result in an increase of the motor current beyond the set rated motor current. Via heating elements, this current rise heats up the bimetal strips inside the device which then bend and as a result trigger the auxiliary contacts by means of a tripping mechanism. 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 current setting I_e and is stored in the form of a long-term stable tripping characteristic curve (see "Characteristic Curves", https://support.industry.siemens.com/cs/ww/en/ps/16273/char).

The "tripped" status is signaled by means of a switch position indicator. Resetting takes place either manually or automatically after a recovery time has elapsed (for "Function", see Reference Manual "Protection Equipment – 3RU1 and 3RB2 Overload Relays", https://support.industry.siemens.com/cs/ww/en/view/35681830).

The 3RU11 thermal overload relays are suitable for operation with frequency converters. Please refer to the instructions in the Reference Manual "Protection Equipment – 3RU1 and 3RB2 Overload Relays", seehttps://support.industry.siemens.com/cs/ww/en/view/35681830.

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 3RU21 overload relays in sizes S00 to S2, see "SIRIUS 3RU2 thermal overload relays".

Use in hazardous areas

The 3RU11 thermal overload relays are suitable for protecting motors belonging to the "Explosion-proof enclosure d" or "Increased safety e" type of protection.

EC type test certificate for category (2)В G/D exists. It has the number DMTВ 98В ATEXВ G 001.

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.