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.4 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
following IEC test
120/208 V 3-phase
Nominal line voltage
120 Vac
Max. AC operating voltage L-N
150 Vac
Max. AC operating voltage
150 Vac
Temporary Over Voltage (TOV) Charasteristics - 5 sec.
without disconnection
180 Vac withstand
Temporary Over Voltage (TOV) Charasteristics - 120 mn
without disconnection or with safety disconnection
230 Vac disconnection
Operating current
Continious current at Uc
Follow current
Nominal discharge current
15 x 8/20 µs impulses
20 kA
Max. discharge current
max. withstand @ 8/20 µs by pole
50 kA
Total Maximal discharge current
max. total withstand @ 8/20 µs
50 kA
Admissible short-circuit current
100 kA
Protection level
@ In (8/20µs)
1200 V
Protection level L/N
@ In (8/20µs)
1200 V
Protection level L/PE
@ In (8/20µs)
1200 V
Residual Voltage at 3 kA
@ 8/20µs
700 Vac
SPD configuration 3-phase
Connection to Network wire 15 AWG (1.5 mm²). long. 600 mm
Bulkhead (3/4')
Housing material Stainless steel
Operating temperature -40/+85°C
Protection rating IP66
Disconnection indicator Led OFF + audible alarm
See diagram
Standards compliance
IEC 61643-11 / EN 61643-11 / UL1449 4ed.
Installation ground fault breaker Type 'S' or delayed
Thermal disconnector Internal
40 A