Isolators
Explosion Proof & Hazardous Area Isolators | ATEX IECEx | Fire Rated | Switch Disconnectors
Isolators | atex & ieceX
Explosion Proof & Hazardous Area Zone 1 (21) & Zone 2 (22)
Pictured: Zone 1 & Zone 2 Isolators with 25A-180A current rating, GRP enclosures for explosion proof isolation of LV power in hazardous areas.
Thorne & Derrick International, based in the UK, are the leading stockists and suppliers of Isolators for hazardous area and explosive atmosphere applications from market-leading brands including CEAG and Craig & Derricott – a comprehensive range of Explosion Proof isolators are available with ATEX & IECEx certification and explosion protection to both Ex d (Flameproof) and Ex e (Increased Safety) applications.
Craig & Derricott manufacture IECEx & ATEX isolators to protect and maintain low voltage power distribution in hazardous area locations.
Hazardous Area Isolators
- Ex e Hazardous Area Zone 1 & Zone 2 Increased Safety Isolators ATEX & IECEx Certified
- Ex d Hazardous Area Zone 1 & Zone 2 Flameproof Isolators ATEX & IECEx Certified
Hazardous area isolators with current ratings 25A, 40A, 80A and 180A in either 3 or 4 pole versions complete with 1 N/O (Early Break) and 1 N/C (Late Make) auxiliary contacts.
Explosion proof enclosed switchgear is available for both potentially explosive gas (Zone 1 | Zone 2) and dust (Zone 21 | Zone 22) atmospheres and certified to ATEX & IECEx.
Hazardous Area isolators Zone 1 & Zone 2
Selection Table for Explosion Proof Isolators for Explosive Gas Atmospheres
The following selection table enables the specification of Isolators with ATEX & IECEx Certification suitable for installation in hazardous area Zone 1 & Zone 2 potentially explosive atmospheres including:
- Ex e Increased Safety Isolators
- Ex d Flameproof Isolators
Should you require any customer support or technical advice to select the correct isolator please do not hesitate to contact our Sales team:
| Isolator Rating (Amps) | Explosion Proof | Format | Handle Colour | Craig & Derricott Cat No | Optional Brass Earthing Plate | Enclosure Size |
| 25A | Exd | 3P+Aux | Red/Yellow | EXZ1SDR02530 | EXEP0253 | A |
| 4P+Aux | Red/Yellow | EXZ1SDR02540 | EXEP0254 | |||
| 40A | Exd | 3P+Aux | Red/Yellow | EXZ1SDR04030 | EXEP0403 | B |
| 4P+Aux | Red/Yellow | EXZ1SDR04040 | EXEP0404 | |||
| 80A | Exd | 3P+Aux | Red/Yellow | EXZ1SDR08030 | EXEP0803 | C |
| 4P+Aux | Red/Yellow | EXZ1SDR08040 | EXEP0804 | |||
| 180A | Exd | 3P+Aux | Red/Yellow | EXZ1SDR18030 | EXEP1803 | D |
| 4P+Aux | Red/Yellow | EXZ1SDR18040 | EXEP1804 |
ATEX Isolators | Explosion Proof & Certified for Hazardous Area Locations
ATEX Certified Zone 1 & Zone 2 Isolators – a range of 25A – 180A explosion proof isolators supplied in Exe enclosures manufactured from IP65 glass reinforced polyester to ensure the product will withstand being installed in hazardous area locations and the harshest of industrial environments. Safe Isolation – the operating handles can be padlocked in the ‘Off’ position and all lids are mechanically interlocked with the isolating switch and are removable in the ‘On’ position only.
Zone 21 & 22 Explosive Proof Isolators
Selection Table for Explosion Proof Isolators for Explosive Dust Atmospheres
The following selection table enables the specification of Isolators with ATEX & IECEx Certification suitable for installation in hazardous area Zone 21 & Zone 22 potentially explosive atmospheres.
Zone 22 isolators include 20A – 63A explosion proof switch-disconnectors supplied in either IP65 die-cast aluminium or sheet steel enclosures suitable for explosive dust atmospheres. All items are fitted with a handle that allows for up to three padlocks in the Off position. Units are inclusive of fixings outside the enclosure seal area and an external earth point.
Should you require any customer support or technical advice to select the correct isolator please do not hesitate to contact our Sales team:
| Isolator Rating (Amps) | Format | Craig & Derricott Cat No | Enclosure Size | Enclosure Material | IP Rating | Supplied Bottom Entries |
| 20A | 6P+2/EB | SDDG206EBZ22 | A22 | Die-Cast Aluminium | IP65 | 1 x M20 top + 2x M20 bottom |
| 25A | 3P+2/EB | SDDG253EBZ22 | A22 | Die-Cast Aluminium | IP65 | 1 x M20 top + 2x M20 bottom |
| 32A | 3P+2/EB | SDDG323EBZ22 | A22 | Die-Cast Aluminium | IP65 | 1 x M20 top + 2x M20 bottom |
| 6P+2/EB | SDDG326EBZ22 | B22 | 2 x M25 + 1 x M20 bottom | |||
| 40A | 3P+2/EB | SDDG403EBZ22 | B22 | Die-Cast Aluminium | IP65 | 2 x M25 + 1 x M20 bottom |
| 6P+2/EB | SDDG406EBZ22 | |||||
| 63A | 3P+2/EB | SDDG633EBZ22 | B22 | Die-Cast Aluminium | IP65 | 2 x M25 + 1 x M20 bottom |
Typical Zone 22 Applications
• Grain Mills • Powder Coating Plant • Textiles • Chemicals
• Cargo Handling • Woodworking • Pharmaceuticals • Waste Processing
There are different degrees of protection against explosive dusts, and Zone 22 is defined as:-
“A place in which an explosive atmosphere, in the form of a cloud of combustible dust in air, is not likely to occur in normal operation but, if it does occur, will persist for a short period only.”
IECEx Isolators | Explosion Proof & Certified for Hazardous Area Locations
Fire Rated
Complete range of fire rated isolators are available to provide electrical isolation and protection to building services in the event of a fire.
Fire Rated Isolators | Resistant to Fire up to 400 Degrees Celsius 120 Minutes – isolators (switch disconnectors) are installed throughout industrial, building services and HVAC (ventilation fans) projects providing excellent switching ability even under fire conditions.
Isolators – dISCONNECTORS OR SWITCHES?
A Disconnector is a mechanical switch which in the “Open” position, complies with requirements specified for the isolating function. A Disconnector or Isolator is an off-load device and marked “Isolate elsewhere before opening” with an AC20/DC20 utilisation category.
A Switch is a mechanical switcing device capable of making, carrying or breaking current under normal circuit conditions, including specified operating overload conditions. A Switch can also carry, for a specified time, currents under specified abnormal circuit conditions, such as those of a short circuit (utilisation category AC32A duty).
A Switch-Disconnector meets both of these criteria and with a Red/Yellow padlockable handle may also be called a Safety Isolator.
➡ For complete technical details, hazardous area certifications and ordering details about isolators for both Ex d flameproof and Ex e increased safety applications please see the product sections below.
Explosion Proof & Hazardous Area Electrical Equipment
Integrity | Knowledge | Reliability | Electrical HVAC Process Instrumentation Equipment
EXPERTS IN EQUIPMENT FOR EXPLOSIVE ATMOSPHERES
Thorne & Derrick are leaders in the development and distribution of ATEX & IECEx Product Innovations that deliver significant improvements to clients plant, people and operational safety in the explosive atmosphere industries.
Your proactive problem solvers experienced in succession planning for the replacement of obsolete, non-conformant and legacy equipment in hazardous areas.
Your first-choice provider of innovative and competitive solutions to ensure ATEX & IECEx Compliance for Hazardous Area Electrical, HVAC & Process Instrumentation Equipment to UK and international projects.
Panels | Plugs | Isolators | Enclosures | Lighting | Control Stations | Motor Starters | Call Points | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Fans | Security Locks
Competitive Prices | Extensive Stocks | Technical Support | Express Delivery
