Phone No.:
(0250) - 2453877


Relay Test Block and Relay Test Plug

Relay Test Block

Relay Test Plug. Series NWRTP-01
This is a multi finger Test Plug when inserted, open circuits the contacts in the Test Block. The Test Plug consists of 28 nos. 4 mm. dia. sockets. Each socket corresponds to the numbered case terminal and is identified by identical number. Please refer figures # 3.

NWRTP-01 Test Plug when inserted into the Test Block it is securely retained by means of 2 nos. Knurled knobs. Shorting wire links are also provided with the NWRTP - 01 test block. The following accessories are provided with each NWRTP-01 Test Plug.:

4 Nos. 150 mm long cable consisting of 4 mm plugs at both ends,
4 Nos. 50 mm long cable consisting of 4 mm Plugs at both ends.
6 Nos. 4 mm plugs which accepts flexible insulated cable upto 2.5 mm2 tor test lead purposes.


Before inserting the Test Plug NWRTP- 01 into the Test Block NWRTS- 01 it is essential that sockets in NWRTP-01 that corresponds to the current transformer secondary windings are shorted using external shorting wire links. This is to avoid dangerously high voltages. It is also essential to ensure that the ammeter is on the correct range and that it is connected to its test leads, before inserting a test plug to measure current.

Test Plug. Series NWRTP-02

This is a single finger Test Plug that can be inserted into individual test positions as shown in figure # 1. NWRTP-02 consists of two contacts which are insulated from one another. Each contact is connected to a lead wire. For polarity identification, one core is red and the other black. Each NWRTP-02 Test Plug is provided with 1.0 mm2-twln flexible cable of 1.5 metre length. Please refer figure #2.


It is essential that adequate precautions and safety measures are taken before proceeding with the measurements and testing. When using for voltage measurements, it is possible to access hazardous live voltages via the single finger Test Plug. While monitoring secondary CT current, the leads from the single finger Test Block must never be open Circuited. If done, it can generate lethal level voltages.

Technical Specifications :

High Voltage withstand
NWRTS-01/ NWRTS-02/ NWRTS-03/ NWRTS-04 : 2.5 k V rms for 1 minute between all case terminals connected together and the case earth terminal.
NWRTP-01/ NWRTP-02 : 2 k V rms for 1 minute between incoming and outgoing contacts when inserted.
Current withstand :
NWRTS-01/ NWRTS-02 / NWRTS-03/ NWRTS-04 : All contact circuits are rated for 20 A continuous or 300A for 1s, ac or dc.
NWRTP-01/ NWRTP-02 : All contacts are rated for 20Acontinuous.
Temperature :
Storage & transit : -250C to + 700C
Operating : -250C to + 550C
Humidity : Tested for 56 days at 90% RH & + 400C
Enclosure Protection : IP 50. Dust protected.
EMC compliance : Relay Test Blocks and Relay test plugs have been classified as electromagnetically benign. It has therefore, been excluded from European Community EMC directive ( 89/336/EEC)

Panel Cut - Out Details

Relay Test Block
Single finger Test Plug.
Code: NWRTP-02
Relay Test Block
NWRTP-02 inserted into
Relay Test Block
NWRTP-01 inserted into
Relay Test Block
Standard Test Block in vertical version NWRTS - 01
Specially designed Test Block for busbar systems, in vertical version. NWRTS - 02
Horizontal version of NWRTS - 01 NWRTS - 03
Horizontal version of NWRTS - 02 NWRTS - 04
Multi-finger Test Plug with accessories. NWRTS - 01
Single finger Test Plug. NWRTS - 02