Safety relays - PSR-MC20-3NO-1DO-24DC-SC

Safety relay for emergency stop and safety doors up to SIL 1, Cat. 1, PL c, depending on the application up to SIL 3, Cat. 4, PL e, 1-channel operation, automatic/manual start, 3 enabling current paths, US = 24 V DC, plug-in screw terminal block


Product Details

Product type Safety relays
Application Emergency stop
Safety door
Solenoid switch
Relay type Electromechanical relay with force-guided contacts in accordance with IEC/EN 61810-3
Insulation characteristics
Overvoltage category III
Typical response time < 175 ms (automatic start)
< 175 ms (manual, monitored start)
Typ. starting time with Us < 250 ms (when controlled via A1)
Typical release time < 20 ms (when controlled via A1 or S12)
Recovery time < 500 ms

Nominal operating mode 100% operating factor
Designation A1/A2
Rated control circuit supply voltage US 20.4 V DC ... 26.4 V DC
Rated control circuit supply voltage US 24 V DC -15 % / +10 %
Rated control supply current IS typ. 80 mA
Power consumption at US typ. 1.92 W
Inrush current 5 A (Δt = 200 µs at Us)
Filter time 1 ms (at A1 in the event of voltage dips at Us)
Protective circuit Surge protection; Suppressor diode
Protection against polarity reversal for rated control circuit supply voltage
Rated insulation voltage 250 V AC
Rated insulation voltage 250 V AC
Rated surge voltage/insulation Safe isolation, reinforced insulation 6 kV between input circuit and enabling current path (13/14) and enabling current path (23/24) and enabling current path (33/34)
Basic insulation 4 kV between all current paths and housing

Digital: Start circuit (S34)
Description of the input non-safety-related
Number of inputs 1
Input voltage range "1" signal 20.4 V DC ... 26.4 V DC
Inrush current typ. 200 mA
Max. permissible overall conductor resistance 150 Ω
Protective circuit Suppressor diode
Current consumption < 10 mA (at S34/24 V)
> -5 mA (at S34/0 V)

Relay: Enabling current paths (13/14, 23/24, 33/34)
Output description safety-related N/O contacts
Number of outputs 3 (undelayed)
Contact type 3 enabling current paths
Contact material AgSnO2
Switching voltage min. 12 V AC/DC
max. 250 V AC/DC (Observe the load curve)
Switching capacity min. 60 mW
Inrush current min. 3 mA
max. 6 A
Limiting continuous current 6 A (observe derating)
Sq. Total current 48 A2 (observe derating)
Switching frequency 0.5 Hz
Mechanical service life 10x 106 cycles
Output fuse 6 A gL/gG (N/O contact)
4 A gL/gG (for low-demand applications)
Signal: M1
Output description non-safety-related
Number of outputs 1 (digital, PNP)
Voltage 22 V DC (Us - 2 V)
Current max. 100 mA
Maximum inrush current 500 mA (Δt = 1 ms at Us)
Short-circuit protection no

Connection technology
pluggable yes
Conductor connection
Connection method Screw connection
Conductor cross section solid 0.2 mm² ... 2.5 mm²
Conductor cross-section AWG 24 ... 12
Screw thread M3
Torque 0.5 Nm ... 0.6 Nm

Status display 3 x green LED
Operating voltage display 1 x green LED

Width 12.5 mm
Height 112.2 mm
Depth 114.5 mm

Housing material Polyamide
Housing color yellow

Safety data
Stop category 0
Safety data: EN ISO 13849
Category 1 (up to Cat. 4 depending on the application)
Performance level (PL) c (up to PL e depending on the application)
Safety data: IEC 61508 - High demand
Safety Integrity Level (SIL) 1 (up to SIL 3 depending on the application)
Probability of a hazardous failure per hour (PFHD) 1.5 x 10-9 (4 A DC13; 5 A AC15; 8760 switching cycles/year)
Proof test interval 240 Months
Duration of use 240 Months
Safety data: IEC 61508 - Low demand
Safety Integrity Level (SIL) 1 (up to SIL 3 depending on the application)
Probability of a hazardous failure on demand (PFDAVG) 1.46 x 10-4
Proof test interval 60 Months
Duration of use 240 Months

Ambient conditions
Degree of protection IP20
Min. degree of protection of inst. location IP54
Ambient temperature (operation) -40 °C ... 55 °C (observe derating)
Ambient temperature (storage/transport) -40 °C ... 85 °C
Maximum altitude ≤ 2000 m (Above sea level)
Max. permissible humidity (storage/transport) 75 % (on average, 85% infrequently, non-condensing)
Max. permissible relative humidity (operation) 75 % (on average, 85% infrequently, non-condensing)
Shock 15g
Vibration (operation) 10 Hz ... 150 Hz, 2g

Certificate CE-compliant

Air clearances and creepage distances between the power circuits
Standards/regulations EN 60947-1

Mounting type DIN rail mounting
Assembly instructions See derating curve
Mounting position vertical or horizontal

Item number 2700466
Packing unit 1 pc
Minimum order quantity 1 pc
Sales Key C18
Product Key DNA181
Catalog Page Page 220 (C-6-2019)
GTIN 4046356912730
Weight per Piece (including packing) 175.6 g
Weight per Piece (excluding packing) 140.4 g
Customs tariff number 85371098
Country of origin DE


ECLASS-9.0 27371819
ECLASS-10.0.1 27371819
ECLASS-11.0 27371819


ETIM 8.0 EC001449


UNSPSC 21.0 39122200


Approval ID: RU C-DE.A*30.B.01082

UL Listed

Approval ID: FILE E 140324

cUL Listed

Approval ID: FILE E 140324

Functional Safety

Approval ID: 44-205-13755201

Functional Safety

Approval ID: 44-780-13755201

cULus Listed

REACh SVHC Lead 7439-92-1
China RoHS Environmentally Friendly Use Period = 50 years
For information on hazardous substances, refer to the manufacturer’s declaration available under “Downloads”

Your advantages

Up to Cat. 1/PL c according to EN ISO 13849-1, SIL 1 according to IEC 62061
Depending on the application, up to Cat. 4/PL e in accordance with ISO 13849-1, SIL CL 3 in accordance with IEC 62061
Low housing width of just 12.5 mm
Manually monitored and automatic activation in a single device
3 enabling current paths, 1 digital signal output
1-channel control