DISCONNECT SWITCHES
A disconnect switch provides a means for breaking the line current to a motor.
They are also called safety switches. They have visible blades,
quick-make/quick-break contacts, plated current carrying parts, cover knockouts
and neutral lugs adjacent to line and load lugs.
Disconnect switches are furnished for the horsepower and voltage of the
specified motor. Load ratings are stated in amps.
Disconnect switches are available in 'General Duty' or 'Heavy Duty'
construction, depending on the line voltage. They are available in two-pole
(single-phase) or three-pole (three-phase) design. They are generally available
in NEMA-1, NEMA-3R, NEMA-4, NEMA-4X and NEMA-12 enclosures. In addition,
disconnect switches are available without enclosures and with modified design
for use in Types S, D and T control panels.
CIRCUIT BREAKERS
Circuit breakers are an alternate means of breaking the line current to a motor.
They are generally more economical than fused disconnect switches for higher
horsepower motors.
Circuit breakers are HMCP Style single-knob adjustable Motor Circuit
Protectors with instantaneous magnetic trip.
Circuit breakers are not available in their own enclosures, but only for use
in Types S, D and T control panels.
MANUAL STARTERS
Manual starters are used for On-Off control of fractional horsepower and small
integral horsepower motors. They are generally used with single-phase motors,
but are also available for small-horsepower three phase motors.
These starters include overload relays as a standard feature and can be
modified with pilot light and selector switch (if manual and automatic operation
is required).
Manual starters are available in the following enclosure styles: NEMA-1,
NEMA-3, NEMA-4, NEMA-7, NEMA-9 and NEMA-12.
MAGNETIC STARTERS
Magnetic starters provide protection for motors as well as a means for control
by a pilot switch without running full motor current through the switch.
Magnetic starters are available in two configurations as follows:
I.E.C. Configuration: based on ratings standards of the International
Electrotechnical Commission. These starters provide higher ratings in physically
smaller devices. Therefore, the load/life ratings are correspondingly reduced.
NEMA Configuration: based on ratings standards of the National
Electrical Manufacturers Association. These starters are somewhat larger and
have higher load/life ratings than the corresponding I.E.C. rated equipment.
Standard features of magnetic starters include bimetallic ambient compensated
overload relays, selectable manual or automatic reset operation, interchangeable
heater packs, single phase protection, electrically isolated NO/NC contacts,
encapsulated magnetic coil, twin break contacts, screw type terminals, straight
through wiring lugs, and are mountable in a horizontal or vertical position.
Magnetic starters are available with many of the modifications listed in this
bulletin and are available in the following enclosure styles: NEMA-1, NEMA-3,
NEMA3R, NEMA-4, NEMA-4X, NEMA-7, NEMA-9, and NEMA-12. In addition, open type
magnetic starters (without enclosures) are available for use in Types S, D and T
control panels.
AVAILABLE MODIFICATIONS
The following modifications are available for Type S, D and T controls and
control panels, where applicable:
• 'Hand-Off -Automatic' (HOA) or 'Test-Off-Automatic' (TOA) selector switch in
the panel cover, for each starter.
• 'Start-Stop' push button in the panel cover, for each starter.
• Momentary contact test button in the panel cover, for each starter.
• Pilot light (pump-run light) in the panel cover, for each starter.
• Separately powered (isolated) control circuit, for each starter.
• Extra electrical interlocks (normally open or normally closed), for each
starter.
• Control circuit transformer (110V fused secondary), for each starter.
• Alarm section with bell, indicating light and silencing button in the panel
cover, for one or two alarm conditions.
• Dry contacts for remote alarm signals.
• Grounding lug.
• Disconnect switch for the control circuit, with an interlock in the panel
cover.
• Elapsed time meter in the panel cover, for each starter.
• Manual pump transfer switch.
• Automatic pump alternator.
• Floor mounting stand (standard panels are for wall mounting or unit
mounting).
Motor Control Types
NOTES:
1. Standard unit includes wiring from float switches to motors. Add motor
controls, if desired, plus control mounting and wiring charge.
2. Deduct standard magnetic starters and add Type D control panel, if preferred.
3. Add motor controls, if desired. Add mounting & wiring, if desired.
4. Add mounting & wiring of motor controls, if desired.
5. Add motor controls, if desired.
6. Standard unit includes Type D or T control panel.
ENCLOSURE TYPES
Specific motor controls or control panels may not be available in all of the
NEMA enclosure types listed.
NEMA-1 (General Purpose): For standard indoor use.
NEMA-2 (Driptight): Excludes falling moisture or dirt (indoor use).
NEMA-3 (Weatherproof): For general outdoor use.
NEMA-3R (Raintight): Excludes beating rain, sleet or ice formation (outdoor
use).
NEMA-4 (Watertight): Excludes hose-directed water (indoor and outdoor use).
Sheet steel or stainless steel enclosures.
NEMA-4X (Watertight): Excludes hose-directed water (indoor and outdoor use).
Non-metallic polyester enclosures.
NEMA-7 (Explosion-proof): For indoor hazardous gas locations (Class I, Groups C
& D).
NEMA-9 (Explosion-proof): For indoor hazardous dust locations (Class II, Groups
E, F & G).
NEMA-12 (Industrial Use): Excludes dripping liquids, falling dirt and dust
(indoor use).
NEMA-13 (Spraytight): Provides dust and spray protection (indoor use).
