General Description: The Power Supply System type PSS1250 is an anodized aluminum
19” Rack unit (4U high) suitable to accept up to 6 plug-in Power Supply Modules type
PSM1250 and 1 Overview module for diagnostic functions. Each module provides 24Vdc,
50 A output. Modules can be paralleled with load sharing circuits which distribute current
load equally to each power supply module to increase reliability and reduce internal power
dissipation. The system accepts up to two independent AC power sources with nominal
voltage range 110 to 240 Vac (±10%). Sixteen configurations of 19” Rack Units are
available with or without Hot Swapping: eight for wall mounting and eight for frontal rack
mounting, always into a cabinet. Two configurations of 9” Rack Units are available with or
without Hot Swapping, only for wall mounting into a cabinet. Two configurations of 7” Rack
Units are available with or without Hot Swapping, only for wall mounting into a cabinet.
For more information about different configurations see page 2.

Features:
SIL 3 for NE Load according IEC 61508:2010, with single PSM1250 module or more
PSM1250 modules in redundant configuration (see ISM0219 for more information).
SIL 1 for ND Load according to IEC 61508:2010, with single PSM1250 module
(see ISM0219 for more information).
SIL 2 for ND Load according IEC 61508:2010, with more PSM1250 modules in
redundant configuration (see ISM0219 for more information).
Systematic capability SIL 3.
2 universal AC Input Lines, nominal 110 to 240 Vac (±10%) (48 to 62 Hz).
Power factor correction.
Installation in Zone 2 / Div. 2 hazardous locations with hot swappable modules.
EMC Compatibility to EN61000-6-2, EN61000-6-4.
ATEX, IECEx, UL & C-UL, TÜV Certifications.
TÜV Functional Safety Certification.
Tested for maritime applications.
Highly regulated output of 24 Vdc, 50 A, for PSM1250 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 with full load.
Fan speed control depending on ambient temperature and output power.
High load fuse breaking capability without interrupting operations.
19” or 9” or 7” Rack unit, 4 U high,anodized aluminium, durable metal enclosure.
Tropicalization for electronic components.
Modbus RTU RS-485 diagnostic output (only for 19” or 9” rack units).