Ex safety switch with separate actuator

Ex 99 ST

  • Ex zone 1 and 21

  • Thermoplastic enclosure, double insulated X

  • Cold-resistant (storage/Ex protection down to –60 °C; mechanical function down to –50 °C)

  • High degree of protection IP66 / IP67 / IP69

  • Suitable for the food processing industry

  • Wiring compartment

  • Actuator head can be repositioned by 4 x 90°

  • Mounting details to EN 50041

  • The actuator is not included in the delivery of the switches

Technical data

Applied standards

EN 60947-5-1, EN IEC 60079-0, EN 60079-1, EN IEC 60079-7, EN 60079-31, EN ISO 13849-1, EN ISO 14119


thermoplastic, glass-fibre reinforced, shockproof, self-extinguishing UL 94 V-0


thermoset, glass-fibre reinforced, shockproof, self-extinguishing UL 94 V-0



Switch type

type 2

Coding level

low coding

Tightening torque

cover screws: 1.5 … 2 Nm

Degree of protection

IP66 (EN 60079-0 + IEC/EN 60529)
IP67, IP69 (IEC/EN 60529)
IP69K (ISO 20653)

B10d (10 % load)

2 million


max. 20 years

Contact material

Silver, nickel-plated

Switching system

slow action, positive break NC contacts A

Switching elements

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


screw connection terminals

Cable cross-section

min. 0.75 mm² (AWG 18), max. 1.5 mm² (AWG 16), incl. conductor ferrules

Cable entry

M20 x 1.5; screwing depth max. 9 mm; use only Ex approved and certified cable glands with min. degree of protection IP66 and suitable for the specified ambient temperature range

Clamping range

7 … 12 mm

Utilisation category


Rated operating current Ie

max. 2 A or 4 A X

Rated operating voltage Ue

max. 500 VAC, 2Ö: max. 400 VAC
max. 250 VAC for unequal potential

Mechanical life

> 1 million operations

Impact energy

max. 7 J down to -40 °C, max. 4 J down to -60 °C

Temperature class


Ambient temperature

–50 °C … +55 °C max. 4 A, +60 °C max. 2 A

Storage and shipping temperature

–60 °C … +60 °C

Short-circuit protection

2 A / 4 A gG/gN fuse

Ex marking

L II 2G Ex db eb IIC T6 Gb,
L II 2D Ex tb IIIC T80 °C Db
IECEx Ex db eb IIC T6 Gb,
Ex tb IIIC T80 °C Db


BVS 16 ATEX E113 X
IECEx BVS 16.0076X
Ö f d a Ô <


Mounting and wiring instructions – Ex 99 ST

German [de], English [en], French [fr], Italian [it], Portuguese [pt], Russian [ru]

PDF 5 MB 18.09.2023
Please go to the relevant product pages for additional downloads.