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3RH2140-2BF40
Siemens 3RH2140-2BF40 available at EU Automation. Get in touch today for a quick price.
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What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
The Siemens 3RH2140-2BF40 is a SIRIUS 3RH2 auxiliary contactor relay designed for control and signaling tasks in industrial automation panels. This compact Size S00 contactor relay features four normally open instantaneous auxiliary contacts and a 110 V DC control coil, making it suitable for use in DC control circuits where reliable auxiliary switching is required.
Built with spring-type terminals, the 3RH2140-2BF40 supports quick, secure wiring and is suitable for mounting on a 35 mm DIN rail or by screw fixing. It has an IP20 front protection rating, finger-safe construction from the front, and a robust mechanical service life of up to 30 million operating cycles under typical conditions.
The unit is rated for auxiliary circuit applications including AC-12, AC-15, DC-12, and DC-13 switching duties, with a contact rating of A600 / Q600 according to UL. With a compact footprint of 45 mm wide, 70 mm high, and 73 mm deep, this Siemens auxiliary contactor is well suited for space-conscious control cabinet installations, machine control systems, interlocking circuits, indication circuits, and relay logic applications.
Built with spring-type terminals, the 3RH2140-2BF40 supports quick, secure wiring and is suitable for mounting on a 35 mm DIN rail or by screw fixing. It has an IP20 front protection rating, finger-safe construction from the front, and a robust mechanical service life of up to 30 million operating cycles under typical conditions.
The unit is rated for auxiliary circuit applications including AC-12, AC-15, DC-12, and DC-13 switching duties, with a contact rating of A600 / Q600 according to UL. With a compact footprint of 45 mm wide, 70 mm high, and 73 mm deep, this Siemens auxiliary contactor is well suited for space-conscious control cabinet installations, machine control systems, interlocking circuits, indication circuits, and relay logic applications.
| Specification | Description |
|---|---|
| Manufacturer | Siemens |
| Part Number | 3RH2140-2BF40 |
| Alternate Part Number | 3RH21402BF40 |
| Product Range | SIRIUS |
| Product Type | Auxiliary contactor / contactor relay |
| Series | 3RH2 |
| Part Description | Siemens 3RH2140-2BF40 is a SIRIUS 3RH2 auxiliary contactor designed for control circuit switching, featuring four normally open instantaneous auxiliary contacts, a 110 V DC coil, compact S00 frame size, and spring-type terminals for secure wiring in industrial control panels. |
| Contact Configuration | 4 NO auxiliary contacts |
| Switching Element Code | 40 E |
| Coil Voltage | 110 V DC |
| Control Voltage Type | DC |
| Coil Operating Range | 0.8 to 1.1 x rated control voltage |
| Closing Power | 4 W |
| Holding Power | 4 W |
| Closing Delay | 30 to 100 ms |
| Opening Delay | 7 to 13 ms |
| Arcing Time | 10 to 15 ms |
| Frame Size | S00 |
| Mounting Method | Screw mounting or snap-on mounting to 35 mm DIN rail |
| Terminal Type | Spring-loaded terminals |
| Rated Insulation Voltage | 690 V |
| Rated Surge Voltage Resistance | 6 kV |
| Degree of Pollution | 3 |
| Front Protection Rating | IP20 |
| Touch Protection | Finger-safe from the front when vertically approached |
| Mechanical Service Life | 30,000,000 operating cycles typical |
| Mechanical Service Life with Auxiliary Switch Block | 10,000,000 operating cycles typical |
| Mechanical Service Life with Electronically Optimised Auxiliary Switch Block | 5,000,000 operating cycles typical |
| Operating Temperature | -25 to +60 °C |
| Storage Temperature | -55 to +80 °C |
| Maximum Installation Altitude | 2,000 m |
| Relative Humidity | 10% minimum; up to 95% at 55 °C according to IEC 60068-2-30 |
| No-Load Switching Frequency | 10,000 operations per hour for AC or DC |
| AC-12 Operational Current | 10 A maximum |
| AC-15 Operational Current | 10 A at 230 V; 3 A at 400 V; 2 A at 500 V; 1 A at 690 V |
| DC-12 Operational Current, 1 Current Path | 10 A at 24 V; 3 A at 110 V; 1 A at 220 V; 0.3 A at 440 V; 0.15 A at 600 V |
| DC-13 Operational Current, 1 Current Path | 10 A at 24 V; 1 A at 110 V; 0.3 A at 220 V; 0.14 A at 440 V; 0.1 A at 600 V |
| DC-12 / DC-13 Operating Frequency | 1,000 operations per hour maximum |
| Auxiliary Contact Reliability | 1 faulty switching operation per 100 million at 17 V, 1 mA |
| Short-Circuit Protection Fuse | gL/gG fuse, 10 A |
| Miniature Circuit Breaker for Auxiliary Circuit up to 230 V | C characteristic, 6 A, 0.4 kA |
| Conductor Cross-Section, Solid or Stranded | 2 x 0.5 to 4 mm² |
| Conductor Cross-Section, Finely Stranded | 2 x 0.5 to 2.5 mm² |
| AWG Conductor Range | 2 x AWG 20 to AWG 12 |
| Width | 45 mm |
| Height | 70 mm |
| Depth | 73 mm |
| Mounting Position | Rotatable +/-180° on a vertical mounting surface; tiltable forward and backward by +/-22.5° |
| UL/CSA Auxiliary Contact Rating | A600 / Q600 |
What type of device is this?
This is a SIRIUS 3RH2 auxiliary contactor/contactor relay designed for control and signaling circuits. It provides four normally open auxiliary contacts and uses a 110 V DC control coil.
How many auxiliary contacts does it have?
It has four instantaneous normally open auxiliary contacts. The switching element identification is 40 E, which corresponds to a 4 NO contact arrangement.
What control voltage does the coil require?
The coil is rated for 110 V DC. Its operating range is 0.8 to 1.1 times the rated coil voltage, and the coil power is 4 W for both closing and holding.
What terminal type is used?
The device uses spring-loaded terminals for the auxiliary and control circuits, helping provide secure conductor retention in control panel installations.
What size and mounting format does it use?
It is a Size S00 device. It can be mounted by screw fixing or snapped onto a standard 35 mm DIN rail.
What are the physical dimensions?
The unit measures approximately 70 mm high, 45 mm wide, and 73 mm deep.
What is the rated insulation voltage?
The rated insulation voltage is 690 V with degree of pollution 3. The rated surge voltage resistance is 6 kV.
What operating temperature range is specified?
The specified operating temperature range is -25 °C to +60 °C. For storage, the range is -55 °C to +80 °C.
What current ratings apply to the auxiliary contacts for AC loads?
For AC-12, the maximum operational current is 10 A. For AC-15, the ratings are 10 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V.
What current ratings apply to DC-13 loads?
For one current path at DC-13, the ratings are 10 A at 24 V, 1 A at 110 V, 0.3 A at 220 V, 0.14 A at 440 V, and 0.1 A at 600 V. Higher ratings are possible when using multiple current paths in series.
What short-circuit protection is specified for the auxiliary switch?
The specified fuse link for short-circuit protection of the auxiliary switch is gL/gG 10 A. For auxiliary circuits up to 230 V, a C characteristic 6 A miniature circuit breaker with 0.4 kA rating is also specified.
What conductor sizes can be connected?
For auxiliary contacts, the terminals accept two solid or stranded conductors from 0.5 to 4 mm², two finely stranded conductors from 0.5 to 2.5 mm², or two AWG conductors from 20 to 12.
- Auxiliary control switching in industrial automation panels
- Signal multiplication for PLC and relay logic circuits
- Interlocking between contactors, starters, and control devices
- Status indication for machine and process control systems
- Remote control of low-power auxiliary circuits
- Integration into motor control centers and electrical cabinets
- Control circuit expansion where four normally open contacts are required
- Switching of DC control signals in 110 V DC systems
- Use in conveyor, packaging, and material handling equipment
- Panel-mounted control applications requiring spring-type terminals and compact S00 sizing
This content has been produced using multiple sources. EU Automation takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
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