MANUAL MOTOR STARTER GUIDE
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7.6.2.1 Manual self-protected Combination Motor Controllers, Type E
Type E represents the only CMC construction type to allow use of a single component. Manual motor starters are the
most common example. The term “self-protected” refers to the level of coordinated protection provided, as these
combinations are subject to an intense validation process following short- circuit, including thousands of electrical
and mechanical operations. For this reason, Type E Combination Motor Controllers ensure proven continuity of ser-
vice following a fault and provide a level of coordinated protection that exceeds even Type 2.
Due to the compact nature of manual motor starters, Type E Combination Motor Controllers are slash voltage rated
(e.g. 600Y/347 V AC). This limits their use to solidly grounded networks for the higher voltages (e.g. above 347 V AC).
Two additional criteria exist for manual motor starters certified as Combination Motor Controllers:
Line-side terminal spacing of 2 inches over-surface (creepage) and 1 inch through-air (clearance) which are similar to
the requirements common for UL 489 / CSA C22.2 No.5 circuit-breakers.
A means of visibly differentiating between thermal (overload) and magnetic (short-circuit) trip, so as not to inhibit
troubleshooting.
These requirements can be met using either accessories (e.g. terminal feeder blocks and side-mount trip indicators)
or inherent design features. MS165 requires no additional accessories to meet the above criteria; MS132 requires only
the line-side terminal feeder block (S1-M3-…). Both types feature an integral trip indicator window, which turns red
upon tripping of the instantaneous release, indicating a short- circuit.
Type E manual self-protected Combination Motor Controllers provide significant advantages for customers by
incorporating control, disconnect, overload and short-circuit protection into one, compact and cost-efficient
product.
Manual self-protected Combination Motor Controller (Type E)
Branch functional requirements
Disconnect means
Short-circuit and ground-fault protection
Control means
Overload protection
: “Type E”
m voltage: 600Y/347V
Upstream branch protection: Not required
Figure 44: Manual self-protected Combination Motor Controller (Type E).
For information regarding manual starter applications in ungrounded (delta) networks above 347 V AC, see Chapter
7.6.1.1 Manual starters (non-combination).
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