Specification

Combination Starter Construction Types Motor Control Solutions
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Combination Starter Construction Types
UL 508 is the UL safety standard for industrial control equipment. Part IV defines
the component functions, construction, testing, and performance requirements of
six styles of combination starters. Each of these six styles meets the requirements
of NEC Article 430 for the motor disconnecting means, the motor branch circuit
short-circuit and ground-fault protection, the motor controller, and the motor
overload (OL) protection. Each provides adequate protection against fire or
personal injury under detected fault conditions.
The UL 508 type designations are differentiated by the actual components used to
protect the motor branch circuit. See Table 3.
Table 3 – UL Combination Starter Type Designations
UL
Combination
Starter Type
Device Used for Component Function
Disconnect
Branch
Circuit
Protection
Motor
Controller
Motor
Overload
Relay
Traditional
Combination
Starters from the
1980s and earlier
A
UL 98 Manual
Disconnect
UL 248 Fuses
UL 508
Magnetic or
Solid State
Controller
UL 508 Motor
Overload Relay
B
UL 508 Motor
Short Circuit
Protector
C
UL 489 Inverse Time
Circuit Breaker
D
UL 489 Instantaneous
Trip Circuit Breaker
Recognized 1990 E
UL 508 Self-Protected
Combination Controller
Recognized 2002 F
UL 508 Manual
Self-Protected
Combination Controller
UL 508
Magnetic or
Solid State
Controller
UL 508 Manual
Self-Protected
Combination
Controller
UL 98 Disconnect Switch
UL 248 Fuses
UL 508 Controller
UL 508 Overload Relay
UL 489 Circuit Breaker
UL 508 Controller
UL 508 Overload Relay
UL 508 Type E
Self-Protected
Combination Starter:
TeSys U
UL 508 Type E
Manual Self-Protected
Combination Starter:
TeSys GV2P & GV3P
UL 508 Type F
Combination Starter:
TeSys GV2P/GV3P +
TeSys D Contactor