Hager JG425DC Manual

Hager Skifte JG425DC

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Side 1/1

Utilisation Categories and Deﬁnitions

3.55

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Fuse - Combination Units - BS EN 60947-3

Many people are attracted to fuse-combination units by their

simplicity in application and their reliability in operation. They are

particularly useful for use on very high prospective fault level

systems where the high energy limiting characteristic of the HRC fuse

can be effectively utilised. In the past fuse-combination units came in

two forms:

Switch Fuse A switch in which one or more poles

have a fuse in series.

Fuse Switch A switch in which one or more poles

have a fuse carrier/link which forms the

moving contact.

The de nitions of these two basic types of fuse combination units 

have now been extended to include units suitable for making,

breaking and isolation and units which are only suitable for providing

isolation for maintenance work.

Deﬁnition Symbol Function

Switch Fuse Making and

breaking current

Disconnector Fuse Isolating

Switch Disconnector

Fuse

Making, breaking

and isolating

Fuse Switch Making and

breaking current

Fuse Disconnector Isolating

Fuse Switch

Disconnector

Making, breaking

and isolating

However, in order to keep the selection of fuse-combination units as

simple as possible, Hager offer a range of high performance double

break switch-fuses, which also satisfy the isolating requirement of the

British standard. These are correctly shown as

and de ned as a Fuse Combination Switch.

Switch disconnectors - BS EN 60947-3. A range of switch

disconnectors (isolators) are available for use on lower current

ratings from 20A to 125A, these switches are rated at AC-22 and

provide a cost effective alternative to the fuse combination switch

especially where the utilisation category AC-23 is not required. ie;

mixed resistive and inductive loads. These may be used at AC-23

providing they are derated in accordance with Table 9 page 3.53.

Utilisation categories

Utilisation categories are not new but they are important because

they help the designer or speci er identify the correct unit for a 

particular application.

The designation of the utilisation category is made up of three parts:

1. The pre x AC or DC, which indicates the nature of the current.

2. The two digit number, which indicates the type of application

the unit is suitable for:

20 Connecting and disconnecting under no-load.

21 Switching of resistive loads.

22 Switching of mixed resistive and inductive loads.

23 Switching of highly inductive loads.

3. The suf x A or B, which indicates whether the unit is suitable 

for frequent or infrequent operation.

A Frequent operation

B infrequent operation.

For example a fuse-combination unit feeding a 400V AC circuit of

mixed resistive and inductive loads which would need to be operated

frequently would require a minimum utilisation category of AC-22A.

If the load was highly inductive, i.e. motor loads, then the minimum

utilisation category would be AC-23A.

Generally, category AC-23 does not cover the switching of

capacitors. Usually this is the subject of agreement between

manufacturer and user.

Motor Power Circuit Protection

Fuse-combination units can be used very effectively for motor power

circuit protection, the energy limiting HRC fuse offering very good

protection to its associated starter. Category AC-23A should be

speci ed for this duty. Special motor circuit protection fuse links are 

available which eliminate the need to t a larger bodied fuse just to 

take care of the starting current of the motor.

The protection of motor power circuits should not be confused with

the direct switching of a single motor. If a fuse-combination unit is

required to perform this function then it must comply with the

requirements of Appendix A of BS EN 60947-3 which makes

provision for different utilisation categories for this application.

Commercial

Distribution

Produkt Specifikationer

Mærke:	Hager
Kategori:	Skifte
Model:	JG425DC

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