29
Figure 5 Application Diagram: Static modular definite time delayed undervoltage relay – Type MVTU 11
27
28
V
s
t
Output
circuits
RL2
1
9
9
secs
5
1
3
RL1-1
6
2
4
RL1-2
Output
contacts
OP
Reset
Case earth connection
CC
BB
AA
BC
bc
Rext(2)
(See Note 6)
C
B
A
Phase rotation
(See Note 3)
Notes:
1. (a) CT shorting links make
before (b) and (c) disconnect.
(b) Short terminals break before (c).
(c) Long terminals.
2. Earthing connections as shown are typical only.
3. VT connections are typical only.
4. Rext(1) is required only for dc supplies
greater than 30V.
5. Contacts RL1-1 and RL1-2 are shown in the de-energised
state. Contacts will make across terminals 1 and
3, 2 and 4 for an undervoltage condition.
6. Rext(2) is required for ac voltage inputs greater than 110V,
ie. when used on low voltage (220–415V) systems where
no VT is available.
(See Note 2)
Power
supply
circuits
13
14
Rext(1)
(See Note 4)
18
RL1
2
1
3
2
4
5
14
13
21
22
27
28
6
Case earth
Module terminal block
viewed from rear
(with integral case
earth strap)
18
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