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Due to RMS continuous product improvement policy this information is subject to change without notice. 4M300/Issue K 10/08/21 - 6/6
Generate the required ordering code as follows: e.g. 4M300-BA
1
2
4M300
TEST BLOCK (SOCKET)
1
AUXILIARY SUPPLY ISOLATING LINK
A Not required
(Isolation Plug not supplied)
B
Required
(Test Block supplied with Isolation Plug)
2
CASE LENGTH
(Match to 4M320 case length)
A Short
Default
B
Long
Ordering Information
Generate the required ordering code as follows: e.g. 4M320-BA
1
2
4M320
TEST PLUG
1
CT SHORTING LINKS
A Manual
(External links to be fitted by operator)
B
Automatic
(Internal links fitted between terminals
21, 23, 25 & 27)
2
CASE LENGTH
(Match to 4M300 case length)
A Short
Default
B
Long
TYICAL APPLICATION OF 4M300 TEST BLOCK & 4M320 TEST PLUG
4M300 Test Block
(REAR VIEW)
Live side
sockets
YELLOW
BLACK
Equipment
side sockets
*
*
Apply secondary injection test signals
Trip & alarm
contacts or
VT connections
as required
Relay scheme
DC auxiliary
Protection scheme
1
3
5
7
9
11
13
15
17
19
21
23
25
27
2
4
6
8
10
12
14
16
18
20
22
24
26
28
S2
S2
S2
P1
P2
S1
S1
S1
A
B
C
Figure 8: Typical use of 4M300 Test Block & 4M320 Test Plug
4M300-A Terminals 13/14 connected as per other positions
4M300-B Terminals 13/14 open circuit when Isolation Plug removed
Phase A
Phase B
Phase C
E/F
DC
auxiliary
4M320-A Manual
4M320-B Automatic
CT shorting links:
Heavy
duty
current
injection
sockets
4M320 Test Plug
(FRONT VIEW)
Fit external
links 13-14
& 15-16 if
station DC
auxiliary
is required
during
testing
1
5
9
17
21
25
3
7
11
19
27
23
2
6
10
14
18
4
8
12
16
20
24
26
28
