Ex ES 98 ST


  • Ex zone 1 and 21
  • Metal enclosure
  • Design to EN 50041
  • Wiring compartment
  • Actuator can be repositioned in factory by 4 x 90°
  • N.B.: Please state required international approvals with your order!
  • Special version only for gas Ex zone 2 and dust Ex zone 22 available
  • 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
EnclosureCorrosion-resistant aluminium, powder-coated, similar to RAL 7016
CoverStainless steel 1.4401, powder-coated, similar to RAL 1003
Actuatorstainless steel 1.4301
Switch typetype 2
Coding levellow coding
Switch insertEx 95
Degree of protectionIP 66 to IEC/EN 60529
Contact materialsilver
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 entry1 x M20 x 1.5 for
cable section 5 … 9 mm
B10d (10 % Load)2 million
TMmax. 20 years
Uimp4 kV
Ui250 V
Ithe6 A
Ie/Ue6 A/250 VAC; 0.25 A/230 VDC
Utilisation categoryAC-15; DC-13
Max. fuse rating6 A gG/gN fuse
Positive break travel8.3 mm
Ambient temperatureT6: –20 °C … +40 °C;
T5: –20 °C … +60 °C
Mechanical life> 1 million operations
Impact energymax. 7 J
Ex marking II 2G Ex d e IIC T6/T5 Gb,
II 2D Ex tD A21 IP67 T80 °C/T95 °C
IECEx Ex de IIC T6/T5 Gb,
Ex tb IIIC T80 °C/T95 °C Db
ApprovalsDMT 01 ATEX E 178
IECEx BVS 07.0014
Ordering details

Slow action

1 NC/1 NO contact

Type   Material no.
Ex ES 98 ST-11 1255734

Slow action

2 NC contacts

Type   Material no.
Ex ES 98 ST-02 1304203

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