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

ESM-BT421 (Order no. 090820)

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 1 contact time-delayed
  • Delay time range 1 s–30 s
  • Short circuit and earth fault/ground fault monitoring
ESM-BT421 (Order no. 090820)

Description

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 the connecting cables 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
Wiring diagram
Wiring diagram

Dimensional drawings

Dimensional drawings

Connection examples

Connection examples

Technical data

Approvals

Zulassung EACZulassung TÜV Rheinland, BMPB mit ZG: Product Safety, Functional SafetyZulassung c_UL_us LISTED

Mechanical values and environment

Housing material
Housing Polyamide PA6.6
Weight
Net 0,25 kg
Ambient temperature -15 ... 40 °C
Degree of protection IP20
Mechanical life
operating cycles 10 x 106
Contact material AgSnO2
Mounting method Mounting rail 35mm according to DIN EN 60715 TH35
Connection Connection terminals
Length of control cable
With conductor cross-section 0.75mm2 1000 m
Safety contacts 13/14, 23/24, 33/34, 47/48
Number of safety contacts 4

Electrical connection ratings

Drop-out delay at 24V AC max.20 ms Emergency stop
Drop-out delay at 24V DC max.30 ms Emergency stop
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 isolation measures.)
Power consumption (apparent power)
At 24V AC 5,3 VA
Rated insulation voltage Ui 250 V
Rated impulse withstand voltage Uimp
Leakage path/air gaps 4 kV
Overvoltage category according to IEC EN 60664-1 3
Reverse polarity protection
On version UB =24V DC
Rated supply frequency 50 ... 60 Hz
Connection rating
at 24V DC 4,7 W
Degree of contamination (external, according to EN 60947-1) 2
Connection cross-section 0,14 ... 2,5 mm² (Connection terminal (size))
Test voltage
Control system/contacts 2,5 kV
Control voltage
On S11 24 V 18,6 ... 26 V Start button
Control current 190 mA
LED indicator 4 status displays (green) for relays K1, K2, K3, K4
Safety contacts 13/14, 23/24, 33/34, 47/48
Type of output
NO Relay contacts positively driven (redundant) (Positively driven relay according to EN 50205)
Switching voltage
AC max.250 V
DC max.24 V
Switching current min.5 mA at 24V
Cumulative current max.15 A For all contacts (Cumulative current at an ambient temperature of T= 20° C: 9A ;T= 30° C: 3A ; T= 40° C: 1A. If these currents are exceeded, a spacing of 5 mm between the devices must be observed.)
Fusing
External contact fuses (safety circuit) according to IEC 60269-1 10A gG
Utilization category acc. to EN 60947-5-1
AC-15 3A, 250V
DC-13 3A, 24V
AC-12 8A ohmic load, 250V (6 operating cycles/min.)
DC-12 8A ohm resistive load, 40V (6 operating cycles/min.)
Breaking capacity according to UL 8A 250V AC / 3A 24V DC per contact
Switching characteristics 3 safety contacts non-delayed, 1 safety contact time-delayed (Contact switching behavior: n.d.: non-delayed d.: delayed)
Delay time
Continuously adjustable 1 ... 30 s

Other

In compliance with EN ISO 13849-1: 2015; EN 62061: 2005 + AC: 2010 + A1: 2013 + A2: 2015; EN 50581: 2012 (RoHS)

Reliability values according to EN ISO 13849-1

Switching contacts time-delay
Category 3 (This value is dependent on the number of switching cycles and the switching current.)
Performance Level PL e (This value is dependent on the number of switching cycles and the switching current.)
PFHD 8.84 x 10-8 (This value is dependent on the number of switching cycles and the switching current.)
Switching contacts non-time-delay
Category 4 (This value is dependent on the number of switching cycles and the switching current.)
Performance Level PL e (This value is dependent on the number of switching cycles and the switching current.)
PFHD 4.22 x 10-8 (This value is dependent on the number of switching cycles and the switching current.)
Number of switching cycles
≤ 0.1 A at 24 V DC 500000 1/Jahr
≤ 1 A at 24 V DC 300000 1/Jahr
≤ 2 A at 24 V DC 100000 1/Jahr
Mission time 20 y (This value is dependent on the number of switching cycles and the switching current.)

Downloads

Complete package

Download all important documents with a single click.

Content:

  • The operating instructions and any additions to the operating instructions or brief instructions
  • Any data sheets to supplement the operating instructions
  • The declaration of conformity
Download Complete Package (ZIP, 2,8 MB)

Single Documents

Other Documents

Ordering data

Ordernumber 090820
Item designation ESM-BT421
Gross weight 0,253kg
Customs tariff number 85364110
ECLASS 27-37-18-19 Device for monitoring of safety-related circuits

Technical support

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

EUCHNER USA Inc.
+1 315 701-0315
info(at)euchner-usa.com