Square D MG60959 Miniature Circuit Breaker
- 100A
- 3 Pole
- DIN Rail
Quantity
Square D MG60959 - 100A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Optimized for industrial motor control, the Square D MG60959 is a 3-pole, 100A miniature circuit breaker from the Multi 9 family. It delivers reliable thermal-magnetic protection for circuits with high inrush currents. This breaker mounts onto standard DIN rails, making it an excellent fit for OEM panels and automation enclosures. Note that this legacy unit has been replaced by the A9N18387. Operating at 480Y/277VAC, it features a D-curve trip profile and a 10kAIC interrupt rating.Specifications
| Brand | Square D |
|---|---|
| Series | Multi 9 |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | DIN Rail |
| Voltage | 240VAC, 480Y/277VAC, 415VAC, 440VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC, 10kA @ 480Y/277VAC, 10kA @ 415VAC, 6kA @ 440VAC |
| Frame Type | MG |
|---|---|
| Terminal Type | Screw/Clamp Terminal |
| For Use With | DIN Rail Panels, OEM Control Panels |
| Wire Gauge | 14-1 AWG |
| Max Wire | 1 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Curve | D |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Undervoltage Release, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No 235, EN/IEC 60947-2, UL 1077 |
| Approval | CE, CSA, IEC, UR |
| Temp Rating | -30C to 70C |
Product FAQs
6 answersWhere is the Square D MG60959 typically installed?
As a Multi 9 series miniature circuit breaker, it is primarily installed in DIN rail panels and OEM control panels for industrial automation and control applications.
Is the MG60959 rated for reverse feed wiring?
Yes, this breaker is suitable for reverse feed applications. This allows electricians to supply line power to either the top or bottom terminals based on the panel layout.
What are the wire gauge requirements for terminating the MG60959?
The screw and clamp terminals on this breaker accept a wide range of wire sizes, accommodating conductors from 14 AWG up to 1 AWG for flexible installation in control panels.
Does the MG60959 require mounting hardware for installation?
No additional mounting hardware is required. It features a standard DIN rail mounting design that snaps securely onto the rail inside OEM control panels.
What is the maximum fault current the MG60959 can safely interrupt?
The maximum interrupting capacity is 10kA when used in 240VAC, 415VAC, or 480Y/277VAC systems. For 440VAC applications, the maximum interrupting rating is reduced to 6kA.
How does the thermal-magnetic trip unit on the MG60959 operate?
The fixed thermal-magnetic mechanism provides dual-function LI protection. The thermal element offers Long-Time protection against sustained overloads, while the magnetic element provides Instantaneous tripping to quickly isolate short circuits.
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