Ex 99 ST


  • Ex zone 1 and 21
  • Thermoplastic enclosure, double insulated
  • Cold-resistant (storage/Ex protection down to –60 °C; mechanical function down to –50 °C)
  • High degree of protection IP 66 / IP 67 / IP 69
  • Wiring compartment
  • Mounting details to EN 50041
  • N.B.: Please state required international approvals with your order!
  • The actuator is not included in the delivery of the switches

Technical data

StandardsEN 60947-5-1; EN 60079-0,
EN 60079-1, EN 60079-7,
EN 60079-31; EN ISO 13849-1;
EN ISO 14119
Enclosureglass-fibre reinforced, shock-proof thermoplastic (PA 66), self-extinguishing UL 94-V0
Coverglass-fibre reinforced, shock-proof thermoset material, self-extinguishing UL 94-V0
Switch typetype 2
Coding levellow coding
Switch insertType 8080/1 ...
Degree of protectionIP 66 (EN 60079-0 + IEC/EN 60529)
IP 67, IP 69 (IEC/EN 60529)
IP 69K (ISO 20653)
Contact materialSilver, nickel-plated
Switching systemslow action, positive break NC contacts
Switching elements1 NC/1 NO contact or 2 NC contacts, type Zb
Connectionscrew connection terminals, min. 0,75 mm² AWG 18, max. 1,5 mm² AWG 16, incl. conductor ferrules
Cable entryM20 x 1,5; screwing depth max. 9 mm; use only Ex approved and certified cable glands with min. degree of protection IP 66 and suitable for the specified ambient temperature range
B10d (10 % Load)2 million
TMmax. 20 years
Utilisation categoryAC-15
Uemax. 500 VAC, 2Ö: max. 400 VAC
max. 250 VAC for unequal potential
Mechanical life> 1 million operations
Impact energymax. 7 J down to -40 °C
max. 4 J down to -60 °C
Temperature classT6
Ambient temperature–60 °C … +55 °C max. 4 A, +60 °C max. 2 A
storage/Ex protection down to –60 °C; mechanical function down to –50 °C
Max. fuse rating6 A gG/gN fuse
Ex marking II 2G Ex db eb IIC T6 Gb,
II 2D Ex tb IIIC T80 °C Db
IECEx Ex db eb IIC T6 Gb,
Ex tb IIIC T80 °C Db
ApprovalsBVS 16 ATEX E113 X
IECEx BVS 16.0076X
Ordering details

Slow action

1 NC/1 NO contact

Type   Material no.
Ex ES 99 ST-11 -60°C X 1354452

Slow action

2 NC contacts

Type   Material no.
Ex ES 99 ST-02 -60°C X 1442235

Straight actuators

Type   Material no.
Straight actuator ST 98/99-B1 1451618
Straight actuator ST 98/99-B1 with rubber 1451736

Angled actuators

Type   Material no.
Angled actuator ST 98/99-B5 1451863

Flexible actuators

Type   Material no.
Flexible actuator ST 98/99-B6 1451865