ul1077 ul508 ul489 ul1077 ul508 ul489 they all look alike? what’s the difference?
TRANSCRIPT
UL1077
UL508
UL489
UL1077
UL508
UL489
They allThey alllook alike?look alike?
What’s the difference?What’s the difference?
UL1077- Supplementary Protector (SP)Supplementary Protector (SP)
Only for overload protection!!!Only for overload protection!!!(has a thermal element inside)(has a thermal element inside)
UL508- Manual Motor Controller (MMC)Manual Motor Controller (MMC)
• Includes overload protectionIncludes overload protection• Includes switching functionIncludes switching function• Includes disconnect functionIncludes disconnect function
UL489- Circuit Breaker (MCCB) (CB)Circuit Breaker (MCCB) (CB)
• Includes overload protectionIncludes overload protection• Includes switching functionIncludes switching function• Includes disconnect functionIncludes disconnect function• Includes short circuit protectionIncludes short circuit protection
Selection
Not by price!!!
• Application• Function• Requirements by NEC or UL standards
• Application• Function• Requirements by NEC or UL standards
… but by:
Selection
Devices may use a combination of allthree types of protection devices.
Devices may use a combination of allthree types of protection devices.
Fuses
Combination 1UL1077 - Supplementary Protection can be used in
combination with a MCCB or a Fuse.UL1077 - Supplementary Protection can be used in
combination with a MCCB or a Fuse.
• Overload protectionOverload protection(SP)(SP)
• Switching functionSwitching function(MCCB)(MCCB)
• Disconnect function Disconnect function (MCCB) (MCCB)
• Short circuit protection Short circuit protection (MCCB) (MCCB)
• Overload protectionOverload protection(SP)(SP)
• Short circuit protection Short circuit protection (Fuse) (Fuse)
• Switching functionSwitching function• Disconnect functionDisconnect function
Combination 2UL508 - Manual Motor Controller can be used in
combination with MCCB and a Fuse.UL508 - Manual Motor Controller can be used in
combination with MCCB and a Fuse.
• Overload protectionOverload protection(MMC)(MMC)
• Switching functionSwitching function(MMC)(MMC)
• Disconnect function Disconnect function (MMC) (MMC)
• Short circuit protection Short circuit protection (MCCB) (MCCB)
• Overload protectionOverload protection(MMC)(MMC)
• Switching functionSwitching function(MMC)(MMC)
• Disconnect functionDisconnect function (MMC) (MMC)
• Short circuit protection Short circuit protection (Fuse) (Fuse)