3RU2116-1EB1

What type of device is this?

This is a Siemens SIRIUS 3RU2 thermal overload relay designed for motor protection. It monitors motor current and trips when an overload condition is detected, helping to protect three-phase motors from excessive current.

What current range does it cover?

The adjustable current setting range is 2.8 to 4 A, making it suitable for motors with full-load currents within that range.

What trip class does it use?

It uses trip Class 10, which is commonly used for standard motor starting applications where the overload relay is expected to trip relatively quickly under sustained overload conditions.

Is it suitable for three-phase motor protection?

Yes. The relay has a 3-pole main current circuit and is intended for three-phase AC motor protection.

What motor power ratings are associated with this relay?

At AC-3 duty, the relay is rated for motor powers of 1.5 kW at 400 V, 2.2 kW at 500 V, and 3 kW at 690 V.

What mounting method is used?

This model is intended for stand-alone installation and may be mounted in any position, according to the product data.

What terminal type does it use?

Both the main current circuit and the auxiliary/control circuit use screw-type terminals.

Does it include auxiliary contacts?

Yes. It has an integrated auxiliary switch with 1 normally closed contact for contactor disconnection and 1 normally open contact for a tripped indication.

Can it detect phase failure?

Yes. The relay includes phase failure detection as part of its motor protection function. It does not provide ground fault detection.

What reset options are available?

The relay provides manual and automatic reset functionality, allowing the reset method to be selected to suit the application.

What are the approximate dimensions?

The unit measures approximately 89 mm high, 45 mm wide, and 80 mm deep.

What is the rated operating voltage?

The rated operating voltage is 690 V, with a rated operating frequency of 50 to 60 Hz.

What environmental conditions can it operate in?

The specified operating temperature range is -40 °C to +70 °C, with temperature compensation from -40 °C to +60 °C and a maximum installation altitude of 2,000 m.

What ingress protection rating does it have?

The relay is rated IP20 at the front and at the terminals, with finger-safe touch protection from the front when installed correctly.

What conductor sizes can be connected to the main terminals?

For the main contacts, it accepts solid or stranded conductors including 2 x 0.5 to 1.5 mm², 2 x 0.75 to 2.5 mm², or 2 x 4 mm², depending on conductor type and preparation.

What tightening torque should be used for the screw terminals?

The specified tightening torque for both main and auxiliary screw terminals is 0.8 to 1.2 N·m.