Hazardous-Location Mechanical Interlocks - Grainger Industrial Supply

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Hazardous Location Specification

Class I, Div 1 and 2, Group B, C, D are for hazardous locations where combustible dust is present during normal operations, normally confined, or not present in ignitable concentrations. Class I hazards are commonly found in petroleum refineries, fuel dispensaries, sewage treatment plants, and processes using chemicals, paints, coatings, or sealants. This rating indicates the electrical device is suitable for use with the following hazardous materials: Group B (hydrogen, butadiene, ethylene oxide, propylene oxide, and acrolein), Group C (ethylene, cyclopropane, and ethyl ether), Group D (acetone, ammonia, benzene, butane, ethanol, gasoline, hexane, methane, methanol, naphtha, natural gas, propane, and toluene).
Class I, Div 1 and 2, Group C, D are for hazardous locations where combustible dust is present during normal operations, normally confined, or not present in ignitable concentrations. Class I hazards are commonly found in petroleum refineries, fuel dispensaries, sewage treatment plants, and processes using chemicals, paints, coatings, or sealants. This rating indicates the electrical device is suitable for use with the following hazardous materials: Group C (ethylene, cyclopropane, and ethyl ether), and Group D (acetone, ammonia, benzene, butane, ethanol, gasoline, hexane, methane, methanol, naphtha, natural gas, propane, and toluene).
Class II, Div 1 and 2, Group F, G are for hazardous locations where combustible dust is present during normal operations, normally confined, or not present in ignitable concentrations. Class II hazards are commonly found in pharmaceutical factories, coal-handling plants, grain elevators, and plants processing flour, feed, or powder. This rating indicates the electrical device is suitable for use with the following hazardous materials: Group F combustible dust (carbon black, charcoal, coal, and coke dust) and Group G combustible dust (chemicals, flour, grain, plastic, and wood).
Class III, Div 1 and 2 are for hazardous locations where ignitable fibers or flyings are present during normal operations, normally confined, or not present in ignitable concentrations. Class III hazards are commonly found in textile mills, lumber mills, and other plants with airborne fibers or sawdust.

Class I, Div 1 and 2, Group B, C, D
Class I, Div 1 and 2, Group C, D
Class II, Div 1 and 2, Group F, G
Class III, Div 1 and 2

Fuse Protection

Fuse protection safely breaks the circuit if the connection experiences an electrical surge. It shuts off power when there's an electrical malfunction to protect equipment from damage.

Non-Fused

Circuit Breaker

Circuit breakers protect electrical systems in the event of an overload or short circuit. Also known as circuit protectors, they shut off power when the current gets too high in order to prevent personnel injury or damage to equipment and circuitry. Unlike fuses, they can be reset to resume normal operation.

Circuit Breaker Type

EHD 480V AC
FD 600V AC
FDB 600V AC

Circuit Breaker Amp Rating

20 A
30 A
40 A
50 A
60 A
70 A
90 A
100 A
150 A

Current Rating

30 A
60 A
100 A
150 A

Voltage Rating

480V AC
600V AC
120/240/480/600V AC
240/480/600V AC
600V AC/250V DC

Phase

Phase refers to the distribution of an electrical load. Single-phase power is a two-wire alternating current (AC) power circuit. It accommodates light loads and is commonly found in homes and offices. Three-phase power is a three-wire AC power circuit. It accommodates higher loads and is commonly found in commercial and industrial buildings.

Single
Three

Horsepower Rating

This rating indicates a device's ability to handle electrical current in horsepower (HP). Horsepower is the measurement of current drawn from equipment like motors, pumps, or appliances at any moment. Electrical devices should have the same or a greater HP rating as the equipment they're powering.

1/3 hp
2 hp
3 hp
5 hp
7-1/2 hp
10 hp
15 hp
20 hp
25 hp
30 hp
40 hp
50 hp
60 hp
75 hp

Number of Poles

Number of poles indicates the number of circuits that can be routed through an electrical device.

Number of Wires

Disconnect Switch

Disconnect switches shut down power to electrical circuits. They help prevent accidents with personnel and damage to equipment by stopping the flow of electricity downstream.

NEMA Enclosure Rating

3 is a safety rating for indoor and outdoor electrical enclosures that specifies a degree of protection against incidental contact, against the entry of solid objects (falling dirt, windblown dust) or water (rain, snow), and against exterior ice formation.
3R is a safety rating for indoor and outdoor electrical enclosures – often called rain-tight or rain-proof – that specifies a degree of protection against incidental contact, against the entry of solid objects (falling dirt) or water (rain, snow), and against exterior ice formation.
4 is a safety rating for indoor and outdoor electrical enclosures with gasketed doors that specifies a degree of protection against incidental contact, against the entry of solid objects (falling dirt, windblown dust) or water (rain, snow, water splashes and sprays), against occasional washdowns, and against exterior ice formation.
4X is a safety rating for indoor and outdoor electrical enclosures–also known as washdown enclosures–that specifies a degree of protection against incidental contact, against the entry of solid objects (windblown dust) or water (rain, snow, water splashes and sprays), against corrosion, and against exterior ice formation.
7BCD is a safety rating for indoor electrical enclosures that are constructed to keep internal explosions contained when used in Class I, Division 1, Groups B, C, or D hazardous locations as specified by the National Electrical Code (NFPA 70).
7CD is a safety rating for indoor electrical enclosures that are constructed to keep internal explosions contained when used in Class I, Division 1, Groups C or D hazardous locations as specified by the National Electrical Code (NFPA 70).
9FG is a safety rating for indoor electrical enclosures that are constructed to prevent the ignition of combustible dust when used in Class II, Division 1, Groups F or G hazardous locations as specified by the National Electrical Code (NFPA 70).

3
3R
4
4X
7BCD
7CD
9FG

Brand

APPLETON ELECTRIC
HUBBELL

Price

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Only digits are allowed. Maximum amount of digits: 6.

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Non-Fused Mechanical Interlocks

30 A Current Rating

60 A Current Rating

100 A Current Rating

Mechanical Interlocks With Circuit Breakers

EHD 480V AC Circuit Breaker Type

FD 600V AC Circuit Breaker Type

FDB 600V AC Circuit Breaker Type


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