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

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

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

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

5. PRICING $ $ $ $ $
UL1077 $
UL508 $
UL489 $

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

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

8. Combination 1 Overload protection (SP) Switching function (MCCB)
UL 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

9. 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)

10. Summary
Standard
Description
UL1077
UL508
UL489
Altech