Ex anti-two-block switch

Ex ZS 73 HES

  • Ex zone 1 and 21
  • Pull-wire unit made of stainless steel 1.4404, hard-coated housing, cover made of stainless steel 1.4404, screws A2
  • Cold-resistant down to -40 °C
  • High degree of protection IP66 / IP67
  • Watertight collar W for protection against penetration of dirt available
  • 2 contacts
  • Tractive force 120 N (counterweight of min. 12 kg to pretension anti-two-block switch)
  • For limiting the hoist height

Technical data

Applied standards

EN 60947-5-1, EN 60079-0, EN 60079-1, EN 60079-31


aluminium die-cast, hard-coated, powder-coated, anthracite grey, similar to RAL 7016


stainless steel 1.4404, powder-coated, signal yellow, similar to RAL 1003

Degree of protection

for hazardous areas: IP65 (EN IEC 60079-0 + IEC/EN 60529)
for non-hazardous areas: IP66/67 (IEC/EN 60529)

B10d (10 % load)

2 million


max. 20 years

Contact material

silver, gold-plated

Switching elements

1 NC/1 NO contact or 2 NC contacts, type Zb

Switching system

slow action


cable BETAflam 145 flex

Cable cross-section

4 x 0.75 mm² (incl. conductor ferrules)

Rated impulse withstand voltage Uimp

4 kV

Rated insulation voltage Ui

250 V

Conventional thermal current Ithe

T6: 6 A, T5: 3 A

Utilisation category

AC-15; DC-13

Rated operating current/voltage Ie/Ue

6 A/250 VAC; 0.25 A/230 VDC

Short-circuit protection

6 A gG/gN fuse

Ambient temperature

T6: –40 °C ... +65 °C,
T5: –40 °C ... +75 °C, +90 °C with max. 3 A

Mechanical life

> 1 million operations

Impact energy

max. 7 J

Ex marking

L II 2G Ex d IIC T6/T5 Gb,
L II 2D Ex tb IIIC
T80 °C/T95 °C Db
IECEx Ex d IIC T6/T5 Gb,
Ex tb IIIC T80 °C/T95 °C Db


PTB 11 ATEX 1003 X
IECEx PTB 07.0034 X


Mounting and wiring instructions

german [de], english [en], french [fr], italian [it], portuguese [pt], russian [ru]

PDF 5 MB 25.05.2023
Please go to the relevant product pages for additional downloads.