4M300

General information

SKU

4M300

Short Description

Test Block

Long Description

The Test Block type 4M300 comprises fourteen test circuits, each connected to a separate pair of rear terminals. During normal operation, each pair is connected by a circuit-shorting link. For testing, the front cover is removed; on the 4M300-B model the Isolation Plug is withdrawn, interrupting the circuit between terminals 13 and 14. Routing the main DC supply through this circuit prevents inadvertent tripping during tests. Inserting the 4M320 Test Plug isolates the live-side from the equipment-side circuits. Its 28 finger-safe 4mm sockets are numbered to match the rear terminals and colour coded black (equipment side) and yellow (live side).

Quantity

Features

Colour coded ‘finger safe’ test sockets suit standard or shrouded type 4mm banana plugs
14 independent circuits suitable for CT or VT connections
Test plug available with automatic CT shorting option
Test plug fitted with insertion handles & locking screws
Side label instructions on changing from normal service condition to the test condition
Optional automatic DC auxiliary isolation function
High current / voltage rating

Application

The 4M300 Test Block has 14 test circuits, each connected to a separate pair of rear terminals. During normal operation each pair is connected by a circuit-shorting link. Access for testing is gained by removing the front cover. On the 4M300-B the Isolation Plug is withdrawn first to interrupt the trip circuit and prevent inadvertent tripping. Inserting Test Plug type 4M320 isolates the live side from the equipment side via 28 colour-coded 4 mm 'finger safe' test sockets (black/yellow).

4m300-v01-1.pdf

4m300-4m320-user-guide.pdf