PSW1250 G.M. International s.r.l.
GM International

SIL3 Power Supply PSW1250, 24Vdc, 50 A, Zone 2 / Div.2 Wall Mounting

The Power Supply type PSW1250 is stainless steel AISI 304 unit. The Supply provides 24Vdc, 50 A output. PSW1250 unit can be paralleled, with load sharing circuits, which distribute current load equally to each power supply to increase reliability and reduce internal power dissipation. The Supply accepts AC power sources with nominal voltage range 110 to 240 Vac (±10%).


  • SIL 3 for NE Load according IEC 61508:2010, with single PSW1250 module or more PSW1250 modules in redundant configuration (see ISM0220 for more information).
  • SIL 1 for ND Load according to IEC 61508:2010, with single PSW1250 module (see ISM0220 for more information).
  • SIL 2 for ND Load according IEC 61508:2010, with more PSW1250 modules in redundant configuration (see ISM0220 for more information).
  • Systematic capability SIL 3.
  • Power factor correction.
  • Installation in Zone 2/Div. 2 hazardous locations.
  • EMC Compatibility to EN61000-6-2, EN61000-6-4.
  • ATEX, IECEx, UL & C-UL, TÜV Certification.
  • TÜV Functional Safety Certification.
  • Tested for maritime applications.
  • Highly regulated output of 24 Vdc, 50 A, for PSW1250 module.
  • Under and over voltage alarm monitoring.
  • 3 over voltage redundant protections.
  • Redundant parallel connections with load sharing.
  • Reduces Power dissipation (in parallel/redundant configuration) by replacing a Schottky diode with Mosfet Active Ideal Diode.
  • 89% efficiency @230 Vac input and 24 Vdc output and full load.
  • Fan speed control depending on ambient temperature and output power.
  • High load fuse breaking capability without interrupting operations.
  • Tropicalization for electronic components.


Product lifecycle policy (EN)

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Technical Data


AC Input voltage nominal 110 to 240 Vac (±10%), with frequency range 48 to 62 Hz.
Power Factor Correction (AC input) 0.98 typ.@230Vac, 0.995 typ.@115Vac, full load.
Efficiency @24Vdc out (full load) better than 89 % @ 230 Vac and 86% @ 115 Vac.
Max. internal power dissipation @24Vdc out (full load) 150 W @ 230 Vac; 195 W @ 115 Vac.
AC input current (sinusoidal at full load) @24Vdc out 14.2 A @ 100 Vac input voltage, 12.2 A @ 115 Vac input voltage, 6.1 A @ 230 Vac input voltage.
Inrush current 37 A peak @ 264 Vac; 32 A peak @ 230 Vac; 16 A peak @ 115 Vac.
AC input connection screw terminal blocks suitable for 4mm2 wires.


Input to Output isolation 2500 Vrms (routine test).
Input to Earth-Ground isolation 1500 Vrms (routine test).
Earth-Ground to Output isolation 500 Vrms (routine test).
Output or Earth-Ground to Fault contact isolation 500 Vrms (routine test).


Voltage 24 Vdc (adjustable from 21 to 28 Vdc).
Regulation 0.4 % for a 100 % load change.
Stability 0.01 % for a 20 % line voltage change.
Ripple ≤ 250 mVpp.
Output current 50 A nominal (@24Vdc out). Parallel connection for redundancy with load sharing capability within ±5 % of output voltage setting.
Output power up to 1300 W nominal (@28Vdc out).
Output Rise Time 2.5 s
Dynamic Response 2 ms for 0-100% load change (overshoot ±1.5% of Vout setting)
Connection M6 screw terminals on copper bars suitable for lug (at least 6.5 mm hole diameter) with 16mm2 wire.
Hold-up time at full load 20 ms (AC input).
Over voltage protection output limited to 30 Vdc plus two redundant crowbars for over voltage protection at 30 Vdc.

Power good signaling

Output good 19.5 V ≤ Vout ≤ 29.5 V
Signaling voltage free SPST normally energized relay (contact closed), de-energize in over/under voltage conditions (contact open).
Contact rating 2 A 50 Vac 100 VA, 2 A 24 Vdc 48 W (resistive load)
Connection screw terminal blocks suitable for 2.5 mm2 wires.

Environmental conditions

Operating temperature limits -40 to +70°C de-rated linearly 65-70% load above 50°C.
Relative humidity limits 95 %, up to 55°C.
Transport, storage temperature limits - 45 to + 85 °C.C36
Max altitude 2000 m a.s.l.


Mounting Wall Mounting into a cabinet.
Weight about 3.5 Kg.
Location installation in Safe Area/Non Hazardous Locations or Zone 2, Group IIC T4 or Class I, Division 2, Group A,B,C,D, T4.
Protection class IP 20, Open Type.
Dimensions Width 60.70mm, Depth 362.53mm, Height 261mm.

Data Sheet

Datasheet of PSW1250 ( EN | CN | IT | ES | JA | DE | FR )

Instruction Manual

Instruction Manual PSW1250 ( EN )
Ex safety instruction manual for PSx1200 series ( EN | IT )
CCC Ex safety instruction manual for PSx1200 series ( EN | CN )


Type Description Area Number Issued by Issue Date
ATEX DEKRA ATEX PSS1250, PSW1250, PSW1230 Series English Certificate ( EN ) Europe BVS 15 ATEX E 006 X DEKRA 2022-08-01
Ex PSx1200 CCC certificate for China ( EN ) China 2020322303000822 NEPSI 2023-04-30
Ex UL-cUL PSW1250, PSS1250 Hazardous ( EN ) North America 20190530-E498342 UL 2019-05-30
FSM TUV IT 22 SIL 0093 Functional Safety Certificate ( EN ) International TUV IT 22 SIL 0093 TUV_SUD 2022-07-25
IECEx DEKRA IECEx PSS1250, PSW1250, PSW1230 Series Certificate ( EN ) International IECEx BVS 15.0006X DEKRA 2022-09-08
SIL TUV C-IS-236198-04 SIL Certificate Summary ( EN ) International C-IS-236198-04 TUV_SUD 2022-10-14

Declarations of Conformity

EU Declaration of Conformity for PSS1250, PSW1250, PSW1230 ( EN | IT )
EU Declaration of Conformity for RoHS, ASBESTOS. ( EN )
Declaration of G3 compliance for D1000_PSD1000-PSD1001-PSD1001C-PSD1004-PSD1220-PSD1220-098 SERIES ( EN )