Togami Electric Mfg. Co., Ltd.

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Togami Electric Mfg. Co., Ltd.

PRODUCTS

　　
Explosion-proof magnetic starters

MZ

Explosion-Proof Magnetic Starters

The explosion-proof magnetic starter, incorporating a Togami electromagnetic switch with a high-performance overload relay, can be used as a safe starter.

　　

Model type

Type Case model Hazardous location Explosion-proof construction
MZB Upper and lower terminal boxes type Applicable in hazardous locations class 1 and 2 d2G4
MZR Lower terminal box type Applicable in hazardous locations class 1 and 2 d2G4
　　

Specifications

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Type Magnetic contactor Maximum applicable load（kW） Standard hub size(pf)
200-220 V 380-440 V Power Load Control
Non-reversing MZR MZB 13-25PAK-26 5.5 11 1 1 3/4
13-35 PAK-35 7.5 15 1 1 3/4
10-25 PAK-26 5.5 11 1 1 3/4
10-35 PAK-35 7.5 15 1 1 3/4
2-50 PAK-50 11 22 1 1/4 1 1/4 3/4
2-80 PAK-80 19 37 1 1/4 1 1/4 3/4
2-100 PAK-100 25 45 1 1/2 1 1/2 3/4
Reversing MZR MZB 13-18R RSK-21 3.7 5.5 1 1 3/4
2-25R RSK-26 5.5 11 1 1 3/4
2-35R RSK-35 7.5 15 1 1 3/4

　　　　　　　　　　　　　　　　　

＜Common specifications＞
1.Material･･･The molded case and cover: Steel type
　Cover: 10,13 type(castrion type), 2 type(Steel type) 2.The service entrance is flameproof threaded joint steelconduit leading type.
3.The equipment name plate is provided. Name indication is made on an acryl pkate in black letters on a white field.
4.Painting Color:
　Internal and external surfaces of enclosures: Munsell No.7.5BG6/1.5
5.The operating push-buttons have indications in English on their surfaces. The color of ON push-button is red and OFF push-button is green.
6.The OFF push-button has a locking device.
7.The thermal overload relay is external manual-resetting type, equipped with a resetting push-button installed on the cover. The color of the resetting push-button is red and it has indication in Japanese and English on its surface.
10.Remote and direct control: Please add supplementary specifications of code to 「B」.

Dimensions

　　 　 　 　 　
TypeEnclosure type No. Dimension（mm） Weight（kg)
A B C D E F G P
MZB 13 705 308 273 500 240 106 ー M12 46
10 866 365 278 700 280 83 ー M16 63
2 1033 355 342 700 280 153 ー M16 105
MZR 13 485 308 273 320 240 88 98 M12 38
10 637 365 278 450 280 104 93 M16 57
2 791 355 342 500 280 117 97 M16 75

・Wiring, operation, maintenance, and inspections of these products must be performed by personnel with specialized knowledge and skills in the installation of explosion-proof electrical equipment and related regulations.
・For installations in hazardous locations, please check the applicable hazardous area classification. The hazardous areas in which products may be installed will vary depending on the specific model.
・Please note that specfications, dimensions, etc., are subject to change without prior notice.

For installation of explosion-proof electrical equipment

Prior to installed of explosion-proof electrical equipments, careful study should be made on the following recommendations.
1. To prevent explosions or files caused by the electrical equipments, every effort should be made, as a prerequisite, to minimize possible danger of explosion at a location where they are to be installed.
2. The electrical equipments should be installed at a location with a minimum posibility of explosion. In case, however, they are unavoidably installed at a hazardous location where explosion is expected, it should be limited to a minimum extent.
3. The explosion-proof electrical equipments to be installed should be the products that have been proved to fully meet he requirements.


Classofication of danger class

Study the sorts of inflammable gas or steam present at a location where the electrical equipments are to be installed in order to determine the explosion class and the firing degree. Then, determine the hazardous locations according to the degree of danger of the locations where the electrical equipments are to be installed. The explosion-proof electrical equipments may be selected on the basis of the determination of explosion class, firing degree and hazardous locations.
The danger class of explosive gas is determined by the firing degree and explosion class.

Firing degree Firing point
G1
G2
G3
G4
G5		 over 450 ℃　　　　　　　　
over 300 ℃ up to 450 ℃
over 200 ℃ up to 300 ℃
over 135 ℃ up to 200 ℃
over 100 ℃ up to 135 ℃


Explosion class Minimum clearance which permits flame running at 25 mm.
1
2
3		 over 0.6 mm
over 0.4 mm up to 0.6 mm
up to 0.4 mm


Classofication example of explosive gases

　 G1 G2 G3 G4 G5
1 Ammonia
Carbon monoxide
Acetic acid
Propane
Methane		 Ethanole
Amyl Acetate-iso
1-Buthanole
Butane
Acetic anhydride		 Gasoline
Hexane		 Acetaldehyde
Ethylether		 　
2 Coal gas Ethylene
Ethylene oxide		 　
3 Water gas
Hydrogen		 Acetylene 　

Classification of hazardous locations

The areas of possible danger or to be dangerous atmosphere are classfield into class 0, class 1 and class 2 depending upon the dangerous time and frequency of occurrence of danger.

Class 0･･･Where dangerous density of explosive gas continues or is held for a long time above the lower limit of an explosion.

Class 1･･･Where a dangerous atmosphere is expected to be present under normal state.

Class 2･･･Where a dangerous atmosphere is expected to be present under abnormal state.


Type of explosion-proof construction

The explosion-proof construction is designed to protect the equipment in use at a hazardous location and can be divided into many different types including pressure-resisting explosion-proof(d), oil-immersed explosion-proof(o), internal pressure-resisting explosion-proof(f), increased safety explosion-proof(e), substantial safety explosion-proof(i), special explosion-proof(s) and other varying types. Out of them, the following construction types are employed in the explosion-proof electrical equipment introduced in this paper.

※ Pressure-resisting explosion-proof type(d)
　 This is of a totally enclosed construction, and should an explosion take place inside the enclosure, the enclosure resists the resultant pressure eliminating a danger of igniting an explosive gas outside.
※ Increased safety explosion-proof type(e)
　This is of the construction which is particularly provided with increased safety on its construction or temperature rise, in order to prevent sparking arcing and overheating on those parts which should not essentially generate them.

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