w w w . r m s p l . c o m . a u
rms
Functional Description
1S20
2
Figure 1: 1S20 surface mount version front panel
Application
Utilised in either new installations or as a simple retrofit in
existing installations, the 1S20 provides high speed detection and
signalling of arc flash hazards for application in air insulated
metalclad switchgear.
Arc fault protection schemes may be implemented on an arc only
basis, or alternatively a current check may be employed where
additional security is warranted.
A current checked scheme may be implemented by making use
of available protection relay logic and a fast acting instantaneous
overcurrent element.
Some typical application examples are shown on the Application
page together with an example schematic.
For further application information refer to the 1S20 User Guide.
The 1S20 is packaged in the ZA12 case that may be flush panel,
surface or rail mounted.
A plug in terminal block is provided to allow panel pre-wiring.
Arc Flash Protection
Arc fault protection is a relatively new technique employed for
the clearance of arcing faults on low voltage panels, MCC’s, BUS
bars and within metal clad switchgear and associated cable
boxes.
Conventional current based protection techniques are at times
challenged by the nature of arcing faults, and can result in slow
protection clearance times. Slow protection clearance times
increase the risk to nearby personnel and increase the degree of
damage to plant and equipment.
By employing an optical detection technique, Arc Fault
Protection results in fast clearance of arcing faults.
Features
>
Compact, economic design
>
Simple panel mounting for retrofit
applications
>
Two or three arc sensor inputs
>
Two high speed tripping duty arc sense
output contacts
>
Push button reset
>
Continuous arc sensor supervision
>
Integrated self-supervision
>
Fail alarm contact
>
24, 32, 48, 110, 125, 220, 240, and 250 V
AC/DC auxiliary
>
Made in Australia
