Frequently asked questions
What is the operating voltage tolerance, catalog numbers, and clearing times for the Masterpact NT and NW shunt trip and shunt close coils?
FA90006
23 May 2022
Issue:What is the operating voltage tolerance, catalog numbers, and clearing times for the Masterpact NT and NW shunt trip and shunt close coils?
Product Line:
Masterpact NT NW
Resolution:
Shunt trip: operating threshold is 0.7x to 1.1x Vn (nominal voltage)
Shunt close: operating threshold is 0.85x to 1.1x Vn
Catalog numbers are the same for MX and MN (shunt trip and shunt close) devices; function is determined by placement in the breaker.
| Voltage (V) at 50/60 Hz | T-, W-, & Y-Frame Fixed | T-Frame Drawout | W- & Y-Frame Drawout |
| 12 DC | S47359 | S33809 | S48490 |
| 24-30 AC/DC | S47360 | S33810 | S48491 |
| 48-60 AC/DC | S47361 | S33811 | S48492 |
| 100-130 AC/DC | S47362 | S33812 | S48493 |
| 200-240 AC/DC | S47363 | S33813 | S48494 |
| 277 AC | S47364 | S33814 | S48495 |
| 380-480 AC | S47365 | S33815 | S48496 |
MX operating time at Vn: 50 ms ±10 (NW and NT)
XF operating time at Vn:
70 ms ±10 (NW ≤ 4000 A)
80 ms ±10 (NW > 4000 A)
55 ms (NT)
NOTE: Shunt trip (MX) and shunt close (XF) circuits must be energized for a minimum of 200 ms. In other words, don't use an impulse signal. Use a signal of at least 200 ms.