Coupling relay - PSR-PC20-1NO-1NC-24DC-SC

Coupling relay for SIL 3 high- and low-demand applications, couples digital output signals to the periphery, 1 enabling current path, 1 confirmation current path, 1 digital signal output, safe state off applications, test pulse filter, TBUS connection, plug-in screw terminal block

Product Details

Utilization restriction
CCCex note Use in potentially explosive areas is not permitted in China.

Product type Coupling relay
Application Safe switch off
High demand
Low demand
Relay type Electromechanical relay with force-guided contacts in accordance with IEC/EN 61810-3
Insulation characteristics
Overvoltage category III
Typ. starting time with Us < 100 ms (with Us when controlled via A1)
Typical release time < 35 ms (when controlled via A1)
Recovery time 500 ms

Maximum power dissipation for nominal condition 3.43 W (IL² = 36 A²)
Nominal operating mode 100% operating factor
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 % (A1/A2)
Rated control supply current IS typ. 50 mA
Power consumption at US typ. 1.2 W
Inrush current typ. 400 mA (Δt < 10 µs at Us)
Filter time max. 2 ms (at A1-A2; test pulse width)
≥ 100 ms (at A1-A2; test pulse rate)
Diagnostic supply voltage UD 24 V DC -15 % / +10 % (31/A2, TBUS)
Input current at UD 6 mA (at 31-A2 for UD; depending on load + 100 mA at M1 and 32)
Inrush current at UD typ. 2.5 A (Δt < 20 µs at UD)
Protective circuit Serial protection against polarity reversal; 33 V suppressor diode (A1/A2)33 V suppressor diode (31/A2)
Rated insulation voltage 250 V AC
Rated surge voltage/insulation Safe isolation, 6 kV reinforced insulation from control circuit, start circuit, confirmation current path, signal output to the enabling current path; 4 kV/basic insulation between all current paths and housing

Relay: Enabling current path
Output description 2 N/O contacts in series, without delay, floating
Number of outputs 1 (safety-related N/O contacts: 13/14 (13F/14))
Contact type 1 enabling current path
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 (N/O contact 13/14)
4 A (N/O contact 13F/14)
Switching capacity according to IEC 60947-5-1 4 A (24 V (DC13); N/O contact 13/14)
5 A (250 V (AC15); N/O contact 13/14)
4 A (250 V (AC15); N/O contact 13F/14)
Limiting continuous current 6 A (13/14 for high-demand)
4 A (13F/14 with high/low demand, 13/14 with low demand)
Sq. Total current 36 A2 (13/14, see to derating)
16 A2 (13F/14, see to derating)
Switching frequency max. 0.5 Hz
Mechanical service life 10x 106 cycles
Output fuse 6 A gL/gG (N/O contact 13/14)
4 A gL/gG (for low-demand applications)
Relay: Confirmation current path
Output description 2 N/C contacts in series, without delay, not floating (reference ground: A2)
Number of outputs 1 (safety-related N/C contacts: 31/32)
Contact type 1 confirmation current path
Contact material AgCuNi, + Au
Switching voltage min. 20.4 V DC
max. 26.4 V DC
Switching capacity min. 20 mW
Inrush current min. 1 mA
max. 100 mA
Limiting continuous current 100 mA
Switching frequency max. 0.5 Hz
Mechanical service life 10x 106 cycles
Output fuse 150 mA Fast-blow
Signal: M1
Output description PNP
Number of outputs 1 (non-safety-related)
Voltage approx. 22 V DC (UD - 2 V)
Current max. 100 mA
Maximum inrush current 500 mA (Δt = 1 ms at Us)
Short-circuit protection no
Output fuse 150 mA fast blow

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 1 x green LED
Operating voltage display 1 x yellow LED
Indication 1 x red 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 50156
Safety Integrity Level (SIL) 3
Safety data: IEC 61508 - High demand
Designation For use in high-demand applications, the diagnostics function must be implemented via the confirmation current path.
Equipment type Type A
Safety Integrity Level (SIL) 3
Safe Failure Fraction (SFF) 99.98 %
MTBF 76.43 Years
λSU 230.38 FIT
λSD 989.32 FIT
λDU 0.20 FIT
λDD 52.58 FIT
Probability of a hazardous failure per hour (PFHD) 1.95 x 10-10 (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
Equipment type Type A
Safety Integrity Level (SIL) 3
Safe Failure Fraction (SFF) 99.68 %
MTBF 60 Years
λSU 1660 FIT
λDU 5.392 FIT
Probability of a hazardous failure on demand (PFDAVG) 1.27 x 10-4
2.36 x 10-5 (for proof test interval = 1 year)
Proof test interval 72 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 ... 70 °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

Identification  II 3 G Ex nA nC IIC T4 Gc
Certificate DEMKO 14 ATEX 1284X
Identification Ex nA nC IIC T4 Gc
Certificate IECEx ULD 14.0003X
Identification cULus
Certificate E140324
Identification Class I, Zone 2, AEx nA nC IIC T4 / Ex nA nC IIC Gc T4 X
Class I, Div. 2, Groups A, B, C, D, T4
Certificate E360692
Identification C, EMC2
Certificate 11253-14 HH
Certificate CE-compliant

Air clearances and creepage distances between the power circuits
Standards/regulations EN 60664-1, EN 60079-15

Mounting type DIN rail mounting
Assembly instructions See derating curve
Mounting position vertical, horizontal, with front of module upward

Item number 2700577
Packing unit 1 pc
Minimum order quantity 1 pc
Sales Key C18
Product Key DNA182
Catalog Page Page 252 (C-6-2019)
GTIN 4046356916417
Weight per Piece (including packing) 204 g
Weight per Piece (excluding packing) 189.1 g
Customs tariff number 85364900
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


Approval ID: TAA00002VZ

UL Listed

Approval ID: FILE E 140324

cUL Listed

Approval ID: FILE E 140324

Functional Safety

Approval ID: 44-780-13755202

Functional Safety

Approval ID: 44-205-13755204


Approval ID: IECEx ULD 14.0003 X

cUL Listed

Approval ID: File E 360692

UL Listed

Approval ID: File E 360692


Approval ID: DEMKO 14 ATEX 1284 X

cULus Listed

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”

Compatible Products

Your advantages

Up to SIL 3 in accordance with IEC 61508
Forcibly guided contacts according to EN 50205
Easy proof test according to IEC 61508 thanks to integrated signal contact
Approved for Class I, Zone 2 applications
Low housing width of just 12.5 mm
Enabling current path protected via internal fuse as an option
Long service life thanks to filtering of controller test pulses
1 enabling current path, 1 digital signal output, 1 diagnostic current path
Couples digital output signals from failsafe controllers to I/O devices (valves, etc.) for electrical isolation and power adaptation
Corrosion protection through protective coating on the PCB