| Rated insulation voltage | 800V |
| Rated operation voltage | 400、500、690V |
| Vonventional free air thermal current with fuse link | 160A |
| NH fuse-link size | 00 , 000 |
| Weight | 290 |
| Rated operational voltage | 690V 500V 230/400V |
| Rated operational current | 100A 125A 160A |
| Utilization category | AC21B AC22B AC23B |
| NH fuse-link size | 00 , 000 00 00 |
| Breaking capacity of fuse link | 50kA 100kA 100kA |
DNH9 Fused Disconnect Dimensions
What is a DNH9 Fused Disconnect?
The fused Disconnect switch is also known as isolator switch, safety switch, switch disconnector, and load-break switch, they are used to isolate circuits by interrupting current flow.
The working principle is to quickly stop the flow of power, the fused disconnect switch will be emergency shutdown, or switching to backup power, then the electrician will be able to service and maintenance distribution panel.
Usually, the main disconnect switch consists of a plastic enclosure, connecting electrical metal contacts, and an actuator (such as handle, shaft, key, etc.).
The plastic enclosure protects the contacts from environmental hazards and also prevents the electrician from touching live circuits.
The user is able to engage or disengage the contacts without opening the enclosure by handle or knob.
For many applications, it is advisable to lock the fused disconnect switch and tag it after it has been activated, so that other electricians do not accidentally turn the switch back on.
What is the Difference Between Fused and Non-Fused Disconnect Switches?
Two primary disconnect switch designs are fusible and non-fusible. As the name suggests, fused disconnect switches are worked with fuses to protect against overcurrent and short circuits.
By comparison, a non-fusible disconnect switch does not prevent short circuits, it simply turns current on or off. Non-fused disconnect switches are only recommended for power systems with fault currents that are less than 5kA or dedicated fuses upstream of the safety switch.
Fused Disconnect Applications
Fused and Non Fused Disconnect Switches are commonly used in the power distribution systems and industrial equipments applications. In a power distribution system, disconnect switches and circuit breakers are used to turn off power in a specific area or to switch from one power source to another in case of an emergency.
In industrial applications, a Fused Disconnect switch can be used to interrupt power to machines and motors when there is a safety hazard or maintenance is required. In fact, many national electrical systems are mandated to utilize electrical disconnect switches in all industrial and manufacturing facilities.
How does a Fused Disconnect Work?
Fused Disconnect Switch and Non-fused Disconnect Switch Disconnector work in conjunction with MCCCB or MCB circuit breakers, which interrupt the current flow in the electrical circuit when the current exceeds the capacity of the circuit. Fused Disconnect Switches can work on AC or DC systems, as well as on single-phase and three-phase power supplies.
Fused Disconnect Switches have many different poles and ampere. Such as GRL DNH9 Fused Disconnect Switch, rated current max 160A. This type of Fused Disconnect has a combined body.
It can be assembled 1P, 2P, 3P, 4P, we can choose pole quantity according to the service electric equipment quantities. For example, the GRL DNH1 type fused disconnect switch is the 3P body, it has 160A,250A, 400A, 630A. We can choose the switch’s rated current according to incoming circuit capacity.
When is a Fused Disconnect Switch required?
Fused disconnect switches usually work well in circuits with extremely high currents, because the fuse guarantees that the circuit will disconnect in the event of a problem. Most modern circuit breakers can be used for the same purpose and for the same applications except for high current situations.
Disconnect Switch Manufacturers
- ABB
- Eaton Bussmann
- Jean Muller
- Mersen(Ferraz Shawmut)
- GRL(No fused Switch Disconnector, Fuse Switch Disconnector, Fuse, Load break switch, Busbar System)
Where to Buying GRL Fused Disconnect
GRL Electric is a professional manufacturer of AC and DC Fuse, No Fused Switch Disconnector, Fused Disconnect Switch and Busbar System since 1992. GRL Disconnect Switches are mainly supplied to government tenders for many countries.
There are many different types of disconnect switches for choosing, such as horizontal disconnect switch, vertical disconnect switch, cylinder fuse switch, and also fuse base. These GRL Brand low-voltage safety switches are TUV and CE certified and are available in both fusible and non-fusible types.
Visit www.grlele.com and www.grlgroup.com to search and filter disconnect switches and request quotes.
Click to view grl DNH7-160 product>>
Where to Learn More About Disconnect Switches
If you are willing to learn more about fused disconnect switches and non-fused disconnect switches, welcome check out the resources of the GRL catalog. As always GRL’s team of local product experts are happy to help and can connect you with skilled electrical engineers.
For help contact us here.
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