Isolating Base

Product code: 45681-284APO

45681-284APO - Isolating Base
The Isolating Base senses and detects short-circuit faults on Discovery loops and spurs.
Full Details

Under normal operating conditions, a low impedance is present between the –IN and –OUT terminals of the base, so that power and signals pass to the next base in line. If a short-circuit or abnormally low impedance occurs, the fall in voltage is sensed and the base isolates the negative supply in the direction of the fault. The isolated section is tested using a current pulse every five seconds. When the short-circuit is removed, the power will automatically be restored. If it is a requirement that no device is lost in the event of a single short-circuit fault, every detector should be fitted to an isolating base. In applications where it is not necessary to use an isolating base for each detector, up to twenty detectors or equivalent surge current may be installed between isolating bases. See PIN sheet PP2090 for full information on loop loading between isolating bases. Consult engineering guides or PIN sheets for quiescent current values of protected devices.

Mechanical Construction

The isolating base is a self-extinguishing polycarbonate moulding with nickel-plated steel terminals for connecting a detector. The associated detector can be locked into the base using the normal locking screw

Backward Compatibility

The isolating base is intended for use with equipment using the Apollo XP95 and Discovery communication protocol.

Product Information

The Isolating Base senses and detects short-circuit faults on Discovery loops and spurs.

Key Features

Up to 20 detectors or their equivalent load, may be installed between isolating bases High brightness LED Detects wiring short-circuits Minimises disruption from short circuits

Warranty10 year
  • CPR
  • FG
  • LPCB
  • VdS
Materials housingPolycarbonate
Materials terminalsNickel plated stainless steel
Product depth24mm
Product diameter100mm
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Data Sheets
How to Order

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Existing customers

Please email your order to us at: or tel: 023 9245 6530.

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Please note…

Remember to quote your account number and purchase order number on any order correspondence.

All orders must be over £50.00 (excluding carriage). Any orders received under the minimum order value will be returned to sender for revision.