UL1077 UL508 UL489 They all look alike? What’s the difference?

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Presentation transcript:

UL1077 UL508 UL489 They all look alike? What’s the difference?

UL1077- Supplementary Protector (SP) Only for overload protection!!! (has a thermal element inside)

UL508- Manual Motor Controller (MMC) Includes overload protection Includes switching function Includes disconnect function

UL489- Circuit Breaker (MCCB) (CB) Includes overload protection Includes switching function Includes disconnect function Includes short circuit protection

PRICING $ $ $ $ $ UL1077 $ UL508 $ UL489 $

Not by price!!! … but by: Selection Application Function Requirements by NEC or UL standards

Selection Devices may use a combination of all three types of protection devices. Fuses

Combination 1 Overload protection (SP) Switching function (MCCB) UL1077 - Supplementary Protection can be used in combination with a MCCB or a Fuse. Overload protection (SP) Switching function (MCCB) Disconnect function (MCCB) Short circuit protection (MCCB) Overload protection (SP) Short circuit protection (Fuse) Switching function Disconnect function

Combination 2 Overload protection (MMC) Switching function (MMC) UL508 - Manual Motor Controller can be used in combination with MCCB and a Fuse. Overload protection (MMC) Switching function (MMC) Disconnect function (MMC) Short circuit protection (MCCB) Overload protection (MMC) Switching function (MMC) Disconnect function (MMC) Short circuit protection (Fuse)

Summary Standard Description UL1077 UL508 UL489 Altech