1. Summary
JHH-2 Junction Box for intrinsically safe circuit(The following abbreviation as Junction Box) is a product developed according to the requirements in GB3836.1-2000 Electrical apparatus for explosive gas atmospheres -- Part 1: General requirements and GB3836.4-2000 Electrical apparatus for explosive gas atmospheres -- Part 4: Intrinsic Safety "I". Apply to environment such as coal mine, the surface, etc. Used for connecting the cable transferring intrinsically safe signal, to continually transfer electric signal, or to make the signal to 1 direction transfer to another 1 to 3 places. Has the advantages of small volume, light weight, convenient installation
1.1 Model Name
JH H - 2
Channel Number
Intrinsic Safety Type
Junction Box

1.2 The Junction box suppose to work normally with the conditions following:
A)Tempereture: 0~40 c;
B)Average Relative Humidity: ≤ 98%RH;
C)Atmospheric Pressure: 80kPa~110kPa;
D)Explosive mixture in coal mine, But without damaging the insulating and corrosive gas.

Explosion Proof Type&Structure
2.1 Explosion Proof Type
2.1.1Intrinsic safety type for mining, Explosion proof marked"ExibI".
2.1.2Protection Grade: IP54;
2.2 Structure: The junction box is composed of a casing, top cover, wiring row and line device. The shell material is made of fire-proof ABS engineering plastics, cable lead-out device adopts a rubber pressing type seal, is flame retardant, antistatic, good sealing performance characteristics.
2.3 Outline Dimensions: 158mm× 80mm× 48mm.
2.4 Weight: 500g

3. Main Technical Characteristics
3.1 Contact capacity: DC 24V/0.5A(With simple equipment provision, use access qualified through the examination of the intrinsically safe circuit).
3.2 Contact resistance: No more than 0.01 OHM in normal situation; Vibration, impact test is less than 0.05 OHM; Life test of not more than 0.02 OHM.
3.3 Introduced Cable Diameter: Φ11mm~Φ13.5mm.
3.4 Connection number: 4 lines; Channel Number: 2.
3.5 The same models, specifications, varieties of junction box parts can be interchanged.
3.6 With GB3836.4 simple equipment provision. When in use, access to qualified through the examination of the intrinsically safe circuit.