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41-753.1M
performance. The inner end of the other leg of the
stack is shaped so the armature restraining spring
can be attached.
2.2. ARMATURE AND MOVING CONTACT
The steel armature has projecting sections at the
sides, near the center, which act as knife-edge bear-
ings and rest on supports that are a part of the mold-
ed base. A stud attached to the core leg of the lami-
nation stack, extends through a hole in the lower end
of the armature. A self-locking stop-nut on the outer
end of the stud is used to limit and adjust the travel
of the armature in the de-energized direction.
The upper end of the armature has an adjustment
screw to which one end of the armature restraining
spring is attached. In both the hand and electrically
reset versions of the relay, a latch screw is mounted
at the extreme end of the armature. For the self-reset
relays, the adjustment screw is replaced by a set
screw which serves to slightly separate the locking
plate (see Figure 1) from the armature. Located be-
Figure 1: Front view (Cover Omitted) and Side View of the MG-6 Electric and Hand Reset Relay in Molded Case.
1–Reset Push Rod,
4–Moving Contact Spring Assembly,
6–Adjusting Screw for Armature Spring Tension,
8–Operating Coil,
2
Courtesy of NationalSwitchgear.com
tween the spring adjustment screw and the latch
(set) screw is a third screw which, when tightened,
applies pressure to the former screws and effectively
locks them in place.
The type MG-6 relay for ac can be used with any
combination of contacts, but the dc relay can have
up to four circuit-opening contacts with the normal
operating spring adjustment. With more than four the
operating spring should be adjusted to give the cor-
rect back contact follow.
The moving contact fingers are mounted on a mold-
ed insulation plate attached to the armature. Silver
contact buttons are on both sides of the fingers so
they may be used as either a circuit-opening or a cir-
cuit-closing contact. The fingers are assembled on
guide pins, between two springs so that a definite
spring compression and contact wipe is assured for
either the contact-closing or the contact-opening
conditions. Flexible leads are connected to the con-
tact fingers. The armature assembly has contact fin-
gers located above and below the bearing points so
2–Stationary Contact,
Type MG-6 Multi-Contact Auxiliary Relay
3–Moving Contact,
5–Latch Adjustment Screw,
7–Reset Coil,
9–Optional Operating Coil Cut-off Contact
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