EUCHNER – More than safety.
EUCHNER – More than safety.

ESM-BT401 (Rend. sz. 090818)

Safety relay ESM-BT.., 4 safety contacts, time-delay, cat. 4

  • Use up to category 4 according to EN ISO 13849-1
  • LED status indicators
  • 1-channel or 2-channel control
  • 4 redundant safety contacts of which 3 contacts time-delayed
  • Delay time range between 1 s and 30 s
  • Short circuit and earth fault/ground fault monitoring
ESM-BT401 (Rend. sz. 090818)


Relay outputs

The outputs are electrically decoupled and of redundant design.

Connection options

By using suitable wiring, the following functions can be selected:

  • Relay start with automatic start, a start button or a monitored start button
  • Monitoring of downstream relays or contactors.
  • Simultaneity monitoring to monitor safety components over time
  • Relay start using a monitored start button
  • Short circuit monitoring to detect short circuits between the connecting cables and to shut down the outputs or prevent relay starting if necessary
  • Earth fault/ground fault monitoring to detect short circuits between a connecting cable and earth or ground and to shut down the outputs or prevent relay starting if necessary.

Time-delayed shutdown

The release time for the time-delay contacts can be set as required using a potentiometer on the safety relay.

Dimension drawing
Dimension drawing

Dimension drawings

Dimension drawings

Connection examples

Connection examples

Műszaki adatok


EAC_RU C-DE.MO05.B.00971/20c_UL_us_E155795_4/1CCC__CQC20012263063

Controls and indicators

LED indicator 4 status displays (green) for relays K1, K2, K3, K4

Electrical connection ratings

Drop-out delay at 24 V AC/DC max. 20 ms Emergency stop
Power consumption
at 24V DC 4.7 W
Power consumption (apparent power)
at 24V AC 5.3 VA
Connection cross-section 0.14 ... 2.5 mm² (Connection terminals (size))
Control voltage
on S11 18.6 ... 26 V
Rated insulation voltage Ui 250 V
Rated supply frequency 50 ... 60 Hz
Rated impulse withstand voltage Uimp
Leakage path/air gaps 4 kV
Operating voltage
AC/DC 24 V -10% ... +10% (All the electrical connections must either be isolated from the mains supply by a safety transformer according to EN 61558-2-6 with limited output voltage in the event of a fault, or by other equivalent insulation measures.)
Test voltage
Control system/contacts 2.5 kV
Control current 190 mA
Overvoltage category according to IEC EN 60664-1 3
Reverse polarity protection
On version UB = 24 V DC
Degree of contamination (external, according to EN 60947-1) 2

Mechanical values and environment

Connection Connection terminals
Degree of protection IP20
Contact AgSnO2
Housing Polyamide PA6.6
Mechanical life
Operating cycles 10 x 10⁶
Control cable length
with conductor cross-section 0.75 mm2 1000 m
Mounting type Mounting rail 35 mm according to DIN EN 60715 TH35
Ambient temperature -15 ... +40 °C

Reliability values acc. to EN ISO 13849-1

Number of switching cycles
≤ 0.1 A at 24 V DC max. 500000 1/y
≤ 2 A at 24 V DC max. 100000 1/y
≤ 1 A at 24 V DC max. 350000 1/y
Mission time 20 y (This value is dependent on the number of switching cycles and the switching current.)


in compliance with EN ISO 13849-1: 2015; EN 62061: 2005 + AC 2010 + A1: 2013 + A2: 2015; EN50581: 2012 (RoHS)

Ordering data

Rend. sz. 090818
Articlename ESM-BT401
Weight 0,254kg
Customsclass 85364110
ECLASS 27-37-18-19 Gerät zur Überwachung von sicherheitsgerichteten Stromkreisen

Műszaki támogatás

Műszaki támogatás
Do you have technical questions about our products, their possible use or applications? Our experts will be happy to help.

EUCHNER Magyarország Kft.
+36 1919 0855