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Hard-wired AC surge protector 3-phase+N

Part Number 750101
  • Hard-wired AC surge protector
  • For 120V network up to 3-phase+N
  • In : 20 kA
  • Imax : 50 kA
  • No leakAge current
  • LED visual indicator + audible alarm
  • UL1449 ed.5 compliant

CITEL M50’s compact, low profi le surge protectors are designed to protect local distribution panels, OEM control panels, PLC’s, and SCADA systems against transient surge events. These devices are installed parallel to the AC network and provide robust surge handling capability. The M50 is available up to three phase applications and is rated at 50kA (8/20μs) transient amps per phase.

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SPD type
120/208 V 3-phase
Nominal line voltage
Un 120 Vac
Max. AC operating voltage
Uc 150 Vac
Max. AC operating voltage
Uc 150 Vac
Temporary Over Voltage (TOV) Characteristics - 5 sec.
Without disconnection
UT 180 Vac withstand
Temporary Over Voltage (TOV) Characteristics - 120 mn
Without disconnection or with safety disconnection
UT 230 Vac disconnection
Operating current
Continious current at Uc
Ic None
Follow current
If None
Nominal discharge current
15 x 8/20 µs impulses
In 20 kA
Max. discharge current
max. withstand @ 8/20 µs by pole
Imax 50 kA
Total Maximum discharge current
max. total withstand @ 8/20 µs
Imax Total 50 kA
Protection level
@ In (8/20µs)
Up 1200 V
Protection level L/N
@ In (8/20µs)
Up L/N 1200 V
Protection level L/PE
@ In (8/20µs)
Up L/PE 1200 V
Residual Voltage at 3 kA
@ 8/20µs
Up-3kA 700 Vac
Admissible short-circuit current
Isccr 100 000 A
SPD configuration
Connection to Network
By wire 15 AWG (1.5mm²). long. 600mm
Bulkhead (3/4')
Housing material
Stainless steel
Operating temperature
Tu -40/+85°C
Protection rating
Disconnection indicator
LED OFF + audible alarm
See diagram
1.086 kg
Standards compliance
IEC 61643-11 / EN 61643-11 / UL1449 ed.5
Thermal disconnector
Installation ground fault breaker
Type 'S' or delayed
Back-up protection device
40 A