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PowerPact H-, J-, and L-Frame Circuit Breakers
Accessories and Auxiliaries
122
02/2016 © 2011–2016 Schneider Electric
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Shunt Trip (MX) and Undervoltage Trip (MN)
A voltage release can be used to trip the circuit breaker using a control signal.
Table 93: Shunt Trip and Undervoltage Trip
Applications
Shunt Trip (MX)
• Trips the circuit breaker when the control voltage rises above 70% of its rated voltage
• Impulse type ≥ 20 ms or maintained control signals
• AC shunt trips are suitable for ground-fault protection when combined with a Class I ground-fault
sensing element
• Continuous duty rated coil
Undervoltage Trip (MN)
• Trips the circuit breaker when the control voltage drops below a tripping threshold
• Drops out between 35% and 70% of the rated voltage
• Continuous duty rated coil
• Circuit breaker closing is possible only if the voltage exceeds 85% of the rated voltage. If an undervoltage
condition exists, operation of the closing mechanism of the circuit breaker will not permit the main contacts
to touch, even momentarily. This is commonly called “Kiss Free”.
Installation and
Connection
• Accessories are common to H-, J-, and L-frame circuit breakers and snap into cavities under the front
accessory cover of the circuit breaker
• Each terminal may be connected by one 18–14 AWG (1.0–2.5 mm
2
) stranded copper wire
Operation
• The circuit breaker must be reset locally after being tripped by shunt trip (MX) or undervoltage trip (MN)
• Tripping by the shunt trip or undervoltage trip has priority over manual (or motor operator) closing; in the
presence of a standing trip order such an action does not result in any closing, even temporarily, of the
main contacts
• Endurance: 50% of the rated mechanical endurance of the circuit breaker
Table 94: Electrical Characteristics
AC DC
Rated Voltage (V) 24, 48, 120, 208/277, 380/480, 525, 600 12, 24, 30, 48, 60, 125, 250
Power Requirements
Pickup (shunt trip) < 10 VA < 5 W
Seal-in (undervoltage trip) < 5 VA < 5 W
Clearing Time (ms) < 50 < 50
Table 95: Shunt Trip and Undervoltage Trip Suffix Codes and Kit Numbers
Voltage
Shunt Trip (MX) Undervoltage Release (MN)
Factory-Installed
Suffix
Field-Installable
Kit No.
Factory-Installed
Suffix
Field-Installable
Kit No.
24 Vac SK S29384 UK S29404
48 Vac SL S29385 UL S29405
120 Vac SA S29386 UA S29406
208/277 Vac SD S29387 UD S29407
380/480 Vac SH S29388 UH S29408
525/600 Vac SJ S29389 UJ S29409
12 Vdc SN S29382 UN S29402
24 Vdc SO S29390 UO S29410
30 Vdc SU S29391 UU S29411
48 Vdc SP S29392 UP S29412
60 Vdc SV S29383 UV S29403
125 Vdc SR S29393 UR S29413
250 Vdc SS S29394 US S29414
Table 96: Adjustable and Fixed Time Delay Units for Undervoltage Trip
Rated Input Voltage
Field-Installable Kit No.
Use Only with These
Undervoltage Releases (MN)
Adjustable Fixed
48 Vac/dc S33680 S29426 S29412
100/130 Vac/dc S33681 — S29413
220/250 Vac/dc S33682 S29427 S29414