PSR Series — General Specification
 
Overview
The ABB PSR series is a compact soft-starter range designed for small to medium three-phase motors. It provides soft start and soft stop using a simple voltage ramp, reducing inrush current and mechanical stress on the motor and connected equipment.
The range covers motor currents from 3 A up to 105 A.
 
 Electrical / Technical Data (General Range)
Rated Operational Current (Ie):
3 A … 105 A
Main Supply Voltage (Motor):
208 … 600 V AC (3-phase)
Control Supply Voltage (Us):
24 V AC/DC
or 100 … 240 V AC (depending on model)
Starts per Hour:
Up to 100 starts/hour (depending on load and ambient conditions)
Starting Method:
Two-phase controlled soft-start and soft-stop with adjustable voltage ramp.
Built-in Bypass Contactor:
Yes, across all PSR models.
Reduces heating and power losses when running at full speed.
Ramp Settings:
Adjustable start ramp time
Adjustable stop ramp time
Adjustable initial voltage at start
Protection:
No built-in overload protection (requires external MMS/overload relay)
Compatible with ABB manual motor starters (e.g., MS116 series)
Ambient Temperature (Operation):
–25 °C to +60 °C (derating may apply above 40 °C)
Cooling / Heat Dissipation:
Natural air convection (smaller sizes) and assisted ventilation (larger models)
Enclosure / Protection Class:
Typically IP20 for smaller sizes (IP10 for some larger units)
Mounting:
Screw mounting
DIN-rail mounting available for small frame sizes
Compact footprint suitable for tight panels
 
Key Features & Benefits
Compact design — ideal where space is limited
Soft start & soft stop — reduces mechanical stress, water hammer, belt slip, and inrush current
Built-in bypass — reduces heat and improves reliability and efficiency
Simple to use — settings adjusted by only a few potentiometers
Flexible supply options — supports 24 V AC/DC or wide-range 100–240 V AC
High cycling capability — suitable for applications with frequent starts
Easily combined with MMS for complete starter protection
Cost-effective entry-level soft-starter solution