Kepco MST 55

The Kepco MST 55-3.5M is a 200 W plug-in power supply module engineered for use within Kepco’s RA 55 rack adapter housing, which accommodates up to nine such units. This hybrid design combines high-frequency switching technology with linear stabilization to deliver both high efficiency and precision regulation across a 0–55 VDC output range at up to 3.5 A maximum current.

## Technical Specifications

• Output voltage: 0–55 VDC
• Maximum output current: 3.5 A DC
• Rated output current: 2.8 A DC at 45°C; 2.1 A DC at 55°C
• Power output: 200 W class (192 W at 55 V, 3.5 A)
• Input voltage: 88–264 V AC, 47–63 Hz
• AC input current: 2.5 A at 120 V AC; 1.5 A at 240 V AC
• Efficiency: 64% at 100% load, 120 V AC
• Output ripple: 5 mV p-p typical
• Output noise (spike, 20 MHz): 10 mV p-p typical
• Operating temperature: −20°C to +65°C (specifications guaranteed from 0°C)
• Active power factor correction: >0.98
• Line regulation: <0.05% of range
• Load regulation: <0.1% of range

## Key Features

• Built-in overload and overvoltage protection
• Polarity reversal capability via internal relays for two-quadrant operation
• Output enable/disable control through relays
• Wide AC input range with built-in power factor correction meeting EN 61000-3-2
• Self-contained cooling fans
• CE marked per Low Voltage Directive, EMC, and RoHS 2 Directives
• UL Listed per 61010-1 safety standard

## Compatibility & Integration

The MST 55-3.5M integrates into Kepco modular power systems via the RA 55 and CA 400 rack housings. Serial control employs Kepco's 375 kHz, 2-wire control bus supporting up to 27 combined MST, MAT, and MBT modules from a single controller. IEEE 488.2 GPIB interface is available through the optional MST 488-27 adapter module. The unit pairs with MAT and MBT series modules to achieve higher power configurations.