PSD1220 G.M. International s.r.l.
GM International

SIL3 Power Supply PSD1220, 24Vdc, 20 A, Zone 2 / Div.2 DIN Rail Mounting

The Power Supply type PSD1220 is an anodized aluminum unit. The Power Supply provides 24Vdc, 20 A output. PSD1220 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 Power Supply accepts AC power input sources with nominal voltage range 110 to 240 Vrms (± 10%). Therefore lower limit is 100 Vrms and upper limit is 264 Vrms.


  • SIL 3 for NE Load according IEC 61508:2010, with single PSD1220 module or more PSD1220 modules in redundant configuration (see ISM0371 for more information).
  • SIL 2 / SIL 3 for ND Load according IEC 61508:2010, with two or more PSD1220 modules in redundant configuration (see ISM0371 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 Certifications.
  • TÜV Functional Safety Certification.
  • Highly regulated output of 24 Vdc, 20 A.
  • 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.
  • Better than 93% efficiency @230 Vac input, full load and full output voltage range.
  • High load fuse breaking capability without interrupting operations.
  • Conformal coated on all boards for durability and protection.


Product lifecycle policy (EN)

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Technical Data


AC Input voltage nominal 110 to 240 Vrms (±10 %), with frequency range 48 to 62 Hz.
Power Factor Correction (AC input, full load) 0.97 typ.@230Vac, 0.995 typ.@115Vac
Efficiency (full load, full Vout range) better than 93% @230Vac and 91% @115Vac.
Max. internal power dissipation (full load, 24 Vout) 35W @230Vac, 43W @115Vac.
Max. AC input current (sinusoidal at full load) 4.8A @ 100Vac & full Vout range; 4.4A @ 110Vac & full Vout range; 2.2A (24Vout), 2.3A (25Vout), 2.4A (26Vout) @ 240Vac.
Inrush current 15.7 Apeak @ 264Vac, 13 Apeak @ 230Vac, 5.2 Apeak @ 115Vac.
AC connection push-in spring connection terminal block suitable for 6mm2 wires.


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


Voltage 24 Vdc factory setting (adjustable range 23.6÷26.1 Vdc by front panel trimmer).
Regulation 0.4% for a 100 % load change.
Stability 0.03 % for a 20 % input line voltage change.
Max. Ripple ≤ 300 mVpp.
Output current 20 A (on full output voltage range and 230 Vac input). Parallel connection for redundancy with load sharing capability within ±2.5 % of output voltage setting.
Output current limitation 22A @ 24Vout, 21A @ 25 & 26 Vout. Protected to short circuit.
Output power up to 520 W @ 26 Vdc output and 230 Vac input.
Max. Output Rise Time (after AC Input supplying) ≤ 2.4 sec.
Dynamic Response 1.5 ms for 10-90% load change (overshoot ±2% of Vout setting).
DC connection push-in spring connection terminal block suitable for 6mm2 wires.
Hold-up time at full load 20 msec (AC input).
Overheat protection double overheat protection on the 1st and 2nd internal stages.
Over voltage protection output limited to 28.5 Vdc plus two redundant crowbars for over voltage protection at 29 Vdc.

Power good signaling

Output good 22 V ≤ Vout ≤ 28 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 push-in spring connection terminal block suitable for 1.5mm2 wires.

Environmental conditions

Operating temperature limits -40 to +60°C de-rated linearly 75-80% load above 50°C.
Relative humidity limits 95%, up to 55°C.
Transport, storage temperature limits - 45 to + 85 °C.
Max altitude 2000 m a.s.l.


Mounting EN/IEC60715 TH 35 DIN-Rail, into a cabinet.
Weight 1.8 Kg (2 Kg with packaging).
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 183 mm, Depth 111 mm, Height 124.5 mm

Data Sheet

Datasheet of PSD1220 ( EN | CN | IT | ES | JA | DE | FR | RU )

Instruction Manual

Instruction Manual PSD1220, PSD1220-098 ( EN )
Safety Manual PSD1220, PSD1220-098 ( 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 PSD1220, PSD1220-098 Series English Certificate ( EN ) Europe BVS 18 ATEX E 004 X DEKRA 2018-01-31
EMC ACMA RCM marking PSD1220, PSD1220-098 (GM internal use only) ( EN ) Australia CF11687_AU-Rev.-01 ACMA 2018-10-15
Ex PSx1200 CCC certificate for China ( EN ) China 2020322303000822 NEPSI 2023-04-30
Ex UL-cUL PSD1220, PSD1220-098 Hazardous ( EN ) North America 20190514-E498342 UL 2019-05-14
FSM TUV IT 22 SIL 0093 Functional Safety Certificate ( EN ) International TUV IT 22 SIL 0093 TUV_SUD 2022-07-25
IECEx DEKRA IECEx PSD1220, PSD1220-098 Series Certificate ( EN ) International IECEx BVS 18.0004X DEKRA 2018-02-12
SIL TUV C-IS-272994-01 SIL Certificate Summary ( EN ) International C-IS-272994-01 TUV_SUD 2022-10-14

Declarations of Conformity

EU Declaration of Conformity for PSD1220 ( 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 )