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STA4A-4121A024MF-EX (Order no. 123076)

STA ATEX safety switch, M20 x 1.5 cable entry, contacts for door position

  • ATEX version
  • 3 x cable entry M20 x 1.5
  • Contacts for the door position
  • Auxiliary release
  • Open-circuit current principle
STA4A-4121A024MF-EX (Order no. 123076)

Description

Version ATEX

Suitable for use in zones 2 and 22 (gases and dusts).
Areas of application:
II 3 G
II 3 D
Use the cable gland supplied.

Approach direction

Horizontal and vertical

Can be adjusted in 90° steps

Increased overtravel for horizontal approach direction

If increased play is required when the door is closed, an actuator with overtravel is available. With this actuator the door can move slightly in the actuating direction when closed. This is important, for example, if safety doors have a rubber end stop. Using an actuator with overtravel, the continuous pressure from the compressed rubber can be reduced. In this way the load is reduced on the switch head and the door mechanism.

Guard locking principle

Open-circuit current (power on to lock): On a guard with guard locking based on the open-circuit current principle, the guard is locked until the power supply to the guard locking solenoid is interrupted. Unlocking is by spring force. The term electrical guard locking is also used.

Switching element

4121

Slow-action switching contact

Contacts for guard locking: 2 positively driven contacts

Contacts for door monitoring: 1 NC contact 1 NO contact

Auxiliary release

The auxiliary release on the front makes it possible to access the machine if there is a malfunction, e.g. a power failure. Unlocking is performed using a tool or a key. The auxiliary release must be protected against misuse (sealing, lacquer).

Scope of delivery ATEX

ATEX cable gland M20 x 1.5 included.

Accessories required

Actuator is not included.

Switching function
Switching function
Dimension drawing
Dimension drawing
Wiring diagram 4121
Wiring diagram 4121
Electromechanical safety switches in use

Functional drawings

Functional drawings

Dimensional drawings

Dimensional drawings
1Auxiliary release
2Cover screw (4x M = 1.5 Nm)
3Locking screw
4Ground the switch via the terminal on the protective plate to prevent electrostatic charging (conductor cross-section 4 mm²)
5ATEX cable gland enclosed (cable diameter 7...13 mm)
6Two screw plugs included (M = 2 Nm)

Connection examples

Connection examples
Door monitoring
Solenoid monitoring

Technical data

Approvals

CCC2024010305643586_SafetySwitch T_STc_UL_us_E155795_2/1

Electrical connection values

Fuse max. 4 A gG
Power consumption 8 W
Connection cross section 0.34 ... 1.5 mm²
Rated insulation voltage Ui 50 V
Rated impulse voltage Uimp 2.5 kV
Utilization category
AC-15 4 A 50 V
DC-13 4 A 24 V
Solenoid operating voltage
AC/DC 24 V -15% ... +10%
Solenoid duty cycle 100 %
Switching voltage
min. at 10 mA 12 V
Switching current
min. at 24 V 1 mA
thermal rated current Ith 4 A

Mechanical values and environment

Anfahrgeschwindigkeit max. 20 m/min
Approach direction A
Connection type
3 x Cable entry M20 x 1.5
Number of door position NC contacts 1
Number of door position NO contacts 1
Number of guard lock monitoring positively driven contacts 2
Extraction force 30 N
Actuation frequency max. 1200 1/h
Actuating force 35 N
Installation orientation any
Insertion depth 24.5 mm
Clamping range for cable 6.5 ... 12 mm
Storage temperature -25 ... 75 °C
Mechanical life 1 x 10⁶
Retention force 20 N
Switching principle Slow-action switching contact
Degree of protection IP67
Ambient temperature -20 ... 75 °C
Material
Contact Silver alloy, gold flashed
Housing Die-cast alloy
Locking force Fmax 3000 N
Locking force FZh 2300 N
Guard locking principle Open-circuit current principle

Characteristic values according to EN ISO 13849-1 and EN IEC 62061

B10DMission time
Guard lock monitoring1.15x10720 y
Important! Values valid at DC-13 100 mA/24V


Miscellaneous

Explosion protection in accordance with ATEX Directive 2024/34/EU
incl. cable gland II3G Ex nR IIB T4 Gc X /II3D Ex tc IIIC T110°C Dc X

In combination with actuator ACTUATOR-S-G-SN-C2115

Overtravel 5 mm

Accessories

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, 5,9 MB)

Single Documents

Other Documents

Ordering data

Ordernumber 123076
Item designation STA4A-4121A024MF-EX
Gross weight 0,951kg
Customs tariff number 85365019000
ECLASS 27-27-26-03 Safety switch with guard control