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 $ $ $ $ $

Selection

Not by price!!!

… but by:

• Application • Function • Requirements by NEC or UL standards

Selection

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

Fuses

Combination 1

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

UL508 -

Combination 2

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)

Standard

Summary

Description

UL1077 UL508 UL489 Altech