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12.8.2.5 Wiring the Contact Blocks
The contact blocks are designated (front of cradle to rear of cradle) S50, S51, S52, and S53. Each contact block contains one “a” and one
“b” contact, with the terminal designations as shown below. Each terminal accepts a maximum of one wire, 14 AWG (or smaller), and shall
be tightened to 7 lbin (0.8 Nm).
12.8.2.6 Installing the Contact Blocks
The contact blocks must be firmly seated, with the feet of the contact block latched into the MOC assembly housing. If there is damage to
the contact block assembly, a replacement contact block must be used. Replacement contact blocks may be purchased per catalog number
WLMOCSWK (includes four replacement contact block assemblies).
NOTICE
MOC Reliability
May cause intermittent signaling.
All four contact blocks, whether wired or not, must be installed into the MOC assembly to ensure reliable operation.
NOTICE
Contact block damage.
May cause loss of signaling.
Do not over-extend the feet of the contact block when reinstalling into the MOC assembly.
S50
S51
S52S53
a
3
4
b
1
2
a
3
4
b
1
2
a
3
4
b
1
2
a
3
4
b
1
2
Attention: Four contact
blocks must be installed
for proper operation
Attention: Four contact
blocks must be installed
for proper operation
3,0 x 0,6
1/8“
0,8 Nm
7 lb-in
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