Safety relay module SRM 21 RT2

Enclosure width: 22.5 mm
2 NC or 1 NC/1 NO contact can be connected
Feedback circuit
2 enabling paths
1 transistor output
Manual or automatic reset
LED indicator for switching condition
Crossed wire monitoring
N.B.: Please state required international approvals with your order!

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Technical data

Applied standards	EN ISO 13849-1; EN 62061; EN 60204-1, GS-ET-20; EN 60947-5-1, -3; EN 61326-3-1
Enclosure	black polycarbonate
Contact material	Silver, gold flashed
Mounting	DIN rail mounting
Connection	screw connection terminals with + and - screws
Cable cross-section	min. 1x 0.5 mm² (AWG 20) including conductor ferrules, max. 1x 2.5 mm² (AWG 14) including conductor ferrules, 2x 1.5 mm² (AWG 16) including conductor ferrules
Tightening torque	screw connection terminals: approx. 0.8 Nm
Degree of protection	enclosure IP 40, terminal block IP 20 to IEC/EN 60529, protection against contact to VBG 4

Safety-relevant data:
EN 62061	SIL CL 3
PFH_d	3 x 10^-8 1/h
EN ISO 13849-1	Performance Level PL e
Category	4
T_M	max. 20 years
MTTF_d	> 113 years
DC/DC_avg	> 99 %

Safety requirements n_op
h_op	8 h/day
d_op	220 days/year
t_zyklus	30 s
EN 60204-1	stop category 0

Rated operating voltage U_e	24 VDC ±15 %
Rated operating current I_e	0.125 A
Rated operating isolation voltage U_i	250 VAC
Rated impulse withstand voltage U_imp	4 kV
Conditional short-circuit current	100 A
Inputs	1 NC/1 NO contact or 2 NC contacts, 1 feedback circuit, 1 start input (monitored)
Outputs	2 enabling paths, 1 transistor output as signalling output
Rated operating current/voltage I_e/U_e	to EN 60947-5-1: 2 A/230 VAC; 1 A/24 VDC to CSA: B300/R300, 250 VAC
Conventional thermal current I_the	5 A
Utilisation category	AC-15; DC-13
Contact load capacity	min. 10 mA
Typ. input current	22 mA
Typ. input voltage	20 VDC
Max. load of signalling output	20 mA
Max. fuse rating	power supply 2A slow blow, enabling paths 6 A gG/gN fuse
Delay on energisation/ deenergisation	≤ 20 ms
Risk time	≤ 0.5 s (switch-on delay)
Attendance delay t_v	< 200 ms
Mechanical life	> 50 million operations
Display	1 LED for supply voltage, 1 LED each for input A and B, 1 LED for authorisation
Degree of pollution	2
Overvoltage category	III
Ambient temperature	–22 °C … +55 °C
Storage and shipping temperature	–22 °C … +70 °C
Relative humidity	10 % ... 90 %
Shock resistance	15 g
Approvals
Note	Inductive loads (contactors, relays etc.) are to be suppressed by suitable circuitry. The safety-related data are based on a load of 24 V / 1 A / DC-1 for the enabling paths. With higher load currents for the enabling paths and other requirement rates n_op, the safety-related data vary from the given data and can be provided on request.
Weight	220 g