ATEX Fire Detectors | Zone 1 & Zone 2 Heat & Fire Detector | Ex d, Ex em, Ex ia – Eaton HD1

ATEX Detectors, Control & Distribution Units Zone 1 & Zone 2 Heat Detector Ex d, Ex em, Ex ia – Eaton HD1 Hazardous Area Control & Distribution Units

ATEX Detectors, Control & Distribution Units Zone 1 & Zone 2 Heat Detector Ex d, Ex em, Ex ia – Eaton HD1

ATEX Fire & Heat Detectors

Zone 1 & Zone 2

Eaton MEDC HD1 are ATEX heat detectors that have been designed for use in ATEX & IECEx Zone 1 and Zone 2 hazardous areas. These hazardous are heat detectors are suitable for fire alarm and/or suppression systems in offshore and onshore applications including paint spray booths, flammable material stores, turbine rooms, extract ductwork and other hazardous areas throughout the oil & gas, petrochemical and process industries.

Comprising a Fenwal rate-compensated detector with all-stainless steel external construction, mounted to either a type SM87 marine grade alloy enclosure (Ex d version) or JB10 corrosion-free GRP enclosure (Ex ia, Ex em/UL versions). The contact in the ATEX heat detector closes at alarm temperature.

Eaton MEDC HD1

Eaton MEDC HD1

ATEX Detectors, Control & Distribution Units

Zone 1 & Zone 2

ATEX Detectors, Control & Distribution Units



  • Zone 0, Zone 1 and Zone 2 use.
  • UL listed for USA and Canada
    • Class I, Div 2, Groups A-D.
  • Ex ia IIC T4/T6, Ex d IIB T3/T6 or Ex em II T6.
  • ATEX approved:
    • – Ex II 1G (Exia)
    • – Ex II 2G (Exd/Exem).
  • IECEx Certified Ga
  • BASEEFA certified.
  • TR CU certified.
  • SIL 2 certified.
  • Chinese (CQST) certified.
  • IP66 & IP67.
  • Certified temperature:
    • –20°C to +125°C (Ex d)*.
    • –20°C to +55°C (Ex em/UL).
    • –55°C to +55°C (Ex ia).
  • Stainless steel probe.
  • Detector temperature settings:
    • 60°C to 385°C
    • 140°F to 725°F
  • Marine grade alloy or GRP enclosure*.
  • Optional guard.

*Model dependent.

Eaton MEDC HD1 - Dimensions

Eaton MEDC HD1 – Dimensions

Eaton MEDC HD1

Listed Temperature Settings:

To select appropriate temperature settings, choose detector at 100ºF (38ºC) above maximum ambient temperature.

Temperature SettingToleranceColour Code Text on Probe
(ºF)(ºC) (ºF)(ºC)

MEDC HD1 Hazardous Area Heat Detector

Technical Specification

Hazardous Area Specification
ATEX EEx d IIBCert. no. Baseefa03ATEX0447.
Certified to: EN50014, EN50018, EN50281-1-1.
Ex II 2 GD, EEx d IIB T6 (T3 @ 125ºC).
ATEX Ex d IICCert. no. Baseefa08ATEX0320.
Certified to: EN60079-0, EN60079-1, EN61241-0, EN61241-1.
Ex II 2 GD, Ex d IIC T6, Ex tD A21 T85ºC (-20ºC to + 55ºC).
ATEX EEx emCert. no. Baseefa03ATEX0428.
Certified to: EN50014, EN50019, EN50028.
Ex II 2G, EEx em II T6 (-20ºC to + 55ºC)
ATEX Ex iaCert. no. Baseefa03ATEX0427.
Certified to: EN60079-0, EN60079-11.
Ex II 1G, Ex ia IIC T6 Ga (-55ºC to + 55ºC). (T4 with diodes/resistors).
IECEx Ex iaEx II 1G, Ex ia IIC T6 Ga (-55ºC to + 55ºC). (T4 with diodes/resistors).
IECEx Ex ia: Cert. no. BAS 13.0010.
Certified to: IEC60079-0, IEC60079-11
Ex ia IIC T6 Ga (-55ºC to + 55ºC). (T4 with diodes/resistors)
ULListing no. E252920 – versions up to 450ºF.
Listing no. E254077 – versions from 600ºF to 725ºF.
UL for USA and Canada, listed to Class 1, Div 2. Groups A – D
CUTR1Ex d IIB T3/T6.
2Ex de IIC T4/T6.
0Ex ia IIC T4/T6
Russian Fire Approved.
CQSTCertified Ex ia.
InmetroCertified EEx d, EEx ia & EEx em
ABSAmerican Bureau of Shipping type approval for HD1BBD & HD1B1 only
SILSIL2 certified. Cert no. Sira FSP 12007/02
Technical Specification
MaterialDetector: stainless steel.
Enclosures: Exd – LM25 marine grade alloy.
Exia/Exem/UL – GRP (anti-static).
Stainless steel cover screws.
Optional Guard: 316 stainless steel.
FinishDetector: Sand blasted.
Enclosures: Exia/Exem/UL – Natural black or painted to customer’s
Exd painted to customers specification
Certified Temp-20ºC to 55ºC (T6) Exem, UL, Exd IIC, CQST Exd IIB.
-20ºC to 55ºC (T6) -20ºC to 125ºC (T3) Exd IIB (Not CQST).
-55ºC to 55ºC (T6) Exia.
WeightExd, 2kg.
Exia/Exem/UL, 1.1kg
Ingress ProtectionIP66 & IP67
OperationThe detector contact is normally open and CLOSES at alarm
Contact RatingEx d, EEx em, UL: 125V a.c.-5A, 125V d.c.-0.5A, 48V d.c.-1A, 24V d.c.-2A.
Ex ia: 30V – 300mA
Entries2 x M20 ISO (ATEX/Exd/Exe/Exi versions).
2 x ½” NPT via adaptors (UL version)
Terminals6 x 4sqmm (BK6).
ResistorSeries & EOL resistor (maximum total 2) minimum value (each) 470Ω
DiodesUp to 2 off available in Exd IIB and Exia versions
LabelsOptional stainless steel tag and duty labels


The following code is designed to help in selection of the correct Eaton hazardous area heat detector with ATEX & IECEx approval and certification. Build up the part number by inserting the code for each component into the appropriate box.

Eaton MEDC HD1 - Ordering Requirements

Eaton MEDC HD1 – Ordering Requirements

ATEX Heat Detectors

ATEX Heat Detectors

High Voltage Electrical Equipment

To support the safe and reliable distribution of Medium & High Voltage Electricity in industrial non-hazardous and hazardous area locations, Thorne & Derrick distribute a complete range of MV HV Electrical Connectors, Joints & Terminations including ATEX Certified variants for installation in Zone 1 & Zone 2 explosive atmospheres.