3RH2140-1BB40 Siemens SIRIUS Contactor relay


  • 3RH2140-1BB40
  • Contactor relay
  • Size S00
  • Main contacts: 4 x NO
  • Control voltage: 24 V DC
  • Screw connection

Contactor relay Siemens SIRIUS 3RH2140-1BB40


Contactor relays, size S00, with accessories

IEC/EN 60947‑1, IEC/EN 60947‑4‑1, IEC/EN 60947‑5‑1

The 3RH2 contactor relays are available with screw or spring-loaded terminals. The basic unit contains four contacts with terminal designations according to EN 50011.

The 3RH2 contactor relays are suitable for use in any climate. They are finger-safe according to IEC 60529.

The 3RH21 coupling contactor relays for switching auxiliary circuits are tailored to the special requirements of working with electronic controls.

Contact reliability

High contact stability at low voltages and currents, suitable for solid-state circuits with currents ≥ 1 mA at a voltage of ≥ 17 V.

Surge suppression

RC elements, varistors, diodes or diode assemblies (combination of a diode and a Zener diode) can be plugged onto all 3RH2 contactor relays from the front for damping opening surges in the coil. The plug-in direction is determined by a coding device.

Coupling contactor relays have a low power consumption and an extended solenoid coil operating range.

Depending on the version, the solenoid coils of the coupling contactor relays are supplied either without overvoltage damping (versions 3RH21..‑.HB40 or 3RH21..‑.MB40‑0KT0) or with a diode or suppressor diode connected as standard.


The accessories for the 3RT2 contactors in size S00 can also be used for the 3RH2 contactor relays, see .

Auxiliary switches

The 3RH21 contactor relays (with the exception of coupling contactor relays) can be expanded by up to four contacts by the addition of mounted auxiliary switches.

The auxiliary switch can easily be snapped onto the front of the contactor relays. The auxiliary switch has a centrally positioned release lever for disassembly.

The conventional front auxiliary contacts fulfill the characteristics of positively driven operation and are therefore suitable for safety applications.

Contactor relays in safety-related applications

Contactor relays are a significant part of safety-related applications. They are generally the actuators that perform the switching operation leading to the safe disconnection of the corresponding application or system.

Contactor relays with positively driven operation according to IEC 60947‑5‑1 are generally required for use in safety-related applications. Most of our contactors meet this requirement; a corresponding note can be found in the technical product data sheet.

Contactor relays with increased tamper protection

Increased tamper protection is ensured either by using our contactor relay versions with permanently mounted auxiliary switches installed in the factory (e.g. 3RH22 contactor relays), or by using the as an accessory.

Article No. scheme


The Article No. scheme shows an overview of product versions for better understanding of the logic behind the article numbers.

For your order, please use the article numbers specified in the selection and ordering data.

Technical specifications


Contactor relay, 4 NO, 24 V DC, Size S00, screw terminal


DataSheet in PDF

Weight 0.271 kg
Dimensions 50.00 × 61.50 × 77.50 mm


product brand name


product designation

Auxiliary contactor

product type designation


size of contactor


product extension auxiliary switch


insulation voltage with degree of pollution 3 at AC rated value

690 V

degree of pollution


surge voltage resistance rated value

6 kV

shock resistance at rectangular impulse

shock resistance with sine pulse

mechanical service life (switching cycles)

● of contactor typical

30 000 000

● of the contactor with added electronically optimized auxiliary switch block typical

5 000 000

● of the contactor with added auxiliary switch block typical

10 000 000

reference code acc. to IEC 81346-2


installation altitude at height above sea level maximum

2 000 m

ambient temperature

● during operation

-25 … +60 °C

● during storage

-55 … +80 °C

relative humidity minimum

10 %

relative humidity at 55 °C acc. to IEC 60068-2-30 maximum

95 %

no-load switching frequency

● at AC

10 000 1/h

type of voltage of the control supply voltage


control supply voltage at DC

● rated value

24 V

operating range factor control supply voltage rated value of magnet coil at DC

● initial value


● full-scale value


closing power of magnet coil at DC

4 W

holding power of magnet coil at DC

4 W

closing delay

opening delay

● at DC

7 … 13 ms

arcing time

10 … 15 ms

number of NO contacts for auxiliary contacts


● instantaneous contact


identification number and letter for switching elements

40 E

operational current at AC-12 maximum

10 A

operational current at AC-15

● at 230 V rated value

10 A

● at 400 V rated value

3 A

● at 500 V rated value

2 A

● at 690 V rated value

1 A

operational current at 1 current path at DC-12

operational current with 2 current paths in series at DC-12

operational current with 3 current paths in series at DC-12

operating frequency at DC-12 maximum

1 000 1/h

operational current at 1 current path at DC-13

operational current with 2 current paths in series at DC-13

operational current with 3 current paths in series at DC-13

● at 24 V rated value

10 A

● at 60 V rated value

4.7 A

● at 110 V rated value

3 A

● at 220 V rated value

1.2 A

● at 440 V rated value

0.5 A

● at 600 V rated value

0.26 A

operating frequency at DC-13 maximum

1 000 1/h

design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V

C characteristic: 6 A; 0.4 kA

contact reliability of auxiliary contacts

1 faulty switching per 100 million (17 V, 1 mA)

contact rating of auxiliary contacts according to UL

A600 / Q600

mounting position

+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface

fastening method

screw and snap-on mounting onto 35 mm standard mounting rail

required spacing

● with side-by-side mounting

● for grounded parts

● for live parts

— forwards

10 mm

— upwards

10 mm

— downwards

10 mm

— at the side

6 mm

type of electrical connection for auxiliary and control circuit

screw-type terminals

type of connectable conductor cross-sections

● for auxiliary contacts

— solid or stranded

2x (0.5 … 1.5 mm²), 2x (0.75 … 2.5 mm²), 2x 4 mm²

— finely stranded with core end processing

2x (0.5 … 1.5 mm²), 2x (0.75 … 2.5 mm²)

● at AWG cables for auxiliary contacts

2x (20 … 16), 2x (18 … 14), 2x 12

B10 value with high demand rate acc. to SN 31920

1 000 000; With 0.3 x Ie

proportion of dangerous failures

● with low demand rate acc. to SN 31920

40 %

● with high demand rate acc. to SN 31920

73 %

failure rate [FIT] with low demand rate acc. to SN 31920

100 FIT

T1 value for proof test interval or service life acc. to IEC 61508

20 y

protection class IP on the front acc. to IEC 60529


touch protection on the front acc. to IEC 60529

finger-safe, for vertical contact from the front

Functional Safety/Safety of Machinery

Test Certificates Declaration of Conformity

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