// EXPLOSION PROTECTION

Ball plunger with collar WKU

Features/Options

  • Ex-zone 1 and 2 as well as 21 and 22
  • Thermoplastic enclosure
  • Double insulation Schutzisoliert
  • Slow action with overlapping contacts available
  • Mounting details DIN EN 50 047
  • Suitable for in-line mounting
  • With pre-wired cable, cable length 1 metre
  • Special version only for equipment category 3D, available for dust Ex zone 22
  • Inmetro approval for Brazil to be ordered separately
  • Actuating speed 0.5 m/s with actuating angle of 20°
  • Can be actuated in line with or from side of switch axis
  • Actuator head with captive stainless steel ball actuator
  • Exact repeatability of switching point
  • Collar to protect against entry of foreign bodies



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Technical data

Standards IEC/EN 60947-5-1; EN 1088;
EN 50014; EN 50018;
EN 50281-1-1
Enclosure glass-fibre reinforced, shock-proof thermoplastic, slef-extinguishing UL 94-V0
Switch insert –
Protection class IP 65 according to EN 60529
Contact material silver
Switching system slow or snap action
Switching system EEx 14: change-over contact with double break Zb or 2 NC contacts, galvanically separated contact bridges; EExM 14: change-over contact with single break C or Za
Connection cable H05VV-F
Cable section Za and Zb: 4 x 0.75mm2
Form C: 3 x 0.75mm2
Uimp 4 kV
Ui 250 V
Ithe Form Zb:6 A; Form C and Za:5 A
Ie/Ue Form Zb:6 A/250 VAC, 0.25 A/230 VDC;
Form Za:5 A/250 VAC, 0.2 A/230 VDC; Form C: 5 A/250 VAC, 0.16 A/230 VDC
Utilisation category AC-15, DC-13
Max. fuse rating Form Zb:6 A gL/gG D-fuse; Form C and Za: 5 A gL/gG D-fuse
Ambient temperature –20 °C … +65 °C, Form C: +60 °C, T5: +75 °C
Mechanical life > 1 million operations
Switching frequency 1800/h
Repeat accuracy of switching points ±0.1 mm
Contact opening max. 2 x 4 mm
Ex-marking EEx geprüft II 2G EEx d IIC T6, II 2D IP65 T80°C
Approvals EExM 14: PTB 03 ATEX 1069 X
EExM 1Ö/1S: PTB 03 ATEX 1006 X
EEx 14: PTB 03 ATEX 1070 X
Note Protect switch against mechanical damage!

Contact variants

  Snap action  Slow action 
1 NC/1 NO contact
EExM 14 WKU 1Ö/1S
EEx 14 WKU 1Ö/1S
1 change-over contact
EExM WKU 14
2 NC contacts
EEx 14 WKU 2Ö