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ABB PSE Series Two-Phase Soft Starter, Built-In Bypass
The ABB PSE Series is a true general-purpose soft starter built for small to medium-sized three-phase motors, available in this family with maximum operational current ratings of 37 A, 72 A, and 105 A. It features two-phase control with soft start and stop through a voltage or torque ramp, an operating voltage span of 208...600 V AC, and a rated control voltage of 100...250 V AC at 50/60 Hz. With a built-in bypass for easy installation and energy savings, the PSE Series delivers a strong balance of starting capacity and cost efficiency for demanding industrial applications across pumps, fans, compressors, and conveyors.
Key Features
- Two-Phase Control: Soft start and stop through a voltage or torque ramp for smooth, controlled motor acceleration and deceleration.
- Selectable Current Ratings: This family is offered with maximum operational current options of 37 A, 72 A, and 105 A, covering small to medium-sized three-phase motor applications.
- Voltage Range: Rated operating voltage span from 208...600 V AC with a control voltage of 100...250 V AC at 50/60 Hz.
- Built-In Bypass: Simplifies installation and reduces energy losses once the motor reaches full speed.
- Advanced Protection Functions: Current limit, kickstart, analog output, EOL, underload, and locked rotor protection built in.
- Illuminated Symbol Display: Language-neutral illuminated display for interaction; an identical external keypad rated IP66 is available as an option.
- Flexible Communication: Hardwire Start/Stop and Reset-of-fault inputs, built-in Modbus RTU fieldbus communication, or an external adaptor with a Fieldbus plug.
- Relay Signal Outputs: RUN, TOR, and Event signals available from a relay output in normally open (NO) state.
Technical Specifications
- Series: PSE
- Voltage Rating: 208-600V AC
- Amperage Rating: 18-370A
- Maximum Operational Current Options: 37 A, 72 A, 105 A
- Packaging: 1 ea
Typical Applications
- Pumps
- Fans
- Compressors
- Conveyors
- General Purpose Three-Phase Motor Starting
Why ABB?
ABB engineers the PSE Series to combine high starting capacity with cost efficiency, backed by built-in bypass technology, comprehensive motor protection functions, and flexible communication options including Modbus RTU. Whether you need the 37 A, 72 A, or 105 A rating, each unit shares the same 208...600 V AC operating voltage span and 100...250 V AC control voltage for consistent specification across your fleet of pumps, fans, compressors, and conveyors. For electrical professionals specifying soft starters for demanding industrial applications, the PSE Series offers a reliable, general-purpose solution built for consistent, code-compliant performance and simplified installation.
Manufacturer Resources
Spec Sheet
Product Specs
- Product Type:
- Soft Starter
- Series:
- PSE
- Voltage Rating:
- 208-600V
- Amperage Rating:
- 18-370A
- Configuration:
- Two-Phase Control
- Department:
- Electrical
- Product Group:
- Motor Control & Automation
- Product Subgroup:
- Motor Starters & Contactors
ABB PSE37-600-70 – Frequently Asked Questions
1) What motor sizes will an ABB PSE soft starter handle?
The PSE Series covers three-phase motors with nominal currents from 18 to 370 A, which puts it in small to medium-size territory: pumps, fans, compressors, and conveyors. Pick the unit by the motor's full load current, not by horsepower alone. Three current ratings are offered, with maximum operational currents of 37 A, 72 A, and 105 A.
2) Will a PSE soft starter run on 480V three-phase?
Yes. The PSE rated operating voltage span is 208 to 600 V AC, so 208, 240, 480, and 600 V systems all fall inside it. Control voltage is separate: 100 to 250 V AC at 50/60 Hz, so a standard 120 V control circuit works without an extra transformer.
3) Do I need a separate bypass contactor with the ABB PSE soft starter?
No. Bypass is built into the PSE, so once the motor reaches full speed the current transfers off the SCRs and runs through the internal bypass. That cuts heat losses inside the panel and saves you the contactor, its wiring, and the enclosure space a separate bypass would need.
4) How do I choose between the PSE37, PSE72, and PSE105?
Size by the motor's full load amps against the unit's maximum operational current: PSE37-600-70 at 37 A, PSE72-600-70 at 72 A, PSE105-600-70 at 105 A. All three carry the 600 designation, so all cover the 208 to 600 V AC span and you don't change model family when you move between 480 V and 600 V systems. Go up a size if the motor FLA sits right at the limit or the duty cycle is heavy.
5) What is two-phase control on a soft starter and is it enough for a pump or fan?
Two-phase control means the PSE ramps two of the three phases while the third is connected straight through. You still get a controlled voltage or torque ramp on start and stop, which is what matters for stopping water hammer on a pump or belt snatch on a conveyor. It's the general-purpose approach: less cost than three-phase controlled starting, and it suits the pump, fan, compressor, and conveyor loads this series is aimed at. If you need full three-phase torque control for a heavy-inertia or high-duty start, that's a different class of starter.
6) Does the ABB PSE soft starter have Modbus, or do I need an add-on card?
Modbus RTU is built in, no card needed. You also get hardwired Start/Stop and Reset-of-fault inputs if you're running it straight off a control circuit, and for other protocols there's an external adaptor with a Fieldbus plug. Status back to the PLC comes off relay outputs for RUN, TOR, and Event signals, all normally open.
7) What motor protection is included in the PSE soft starter, or do I still need an overload relay?
Protection is built into the PSE: electronic overload (EOL), underload, locked rotor, and current limit, plus kickstart and an analog output. That covers what a separate overload relay would normally do. Short circuit protection is still a separate device upstream, as with any soft starter.
8) Can I mount the PSE keypad on the enclosure door for washdown areas?
Yes. The PSE has an illuminated symbol display on the unit itself, language-neutral so there's no translated overlay to worry about, and ABB offers an identical external keypad rated IP66 as an option. That IP66 rating is what lets you put the interface on the outside of the enclosure in a wet or dusty plant area. The external keypad is ordered separately from the starter.
9) Is a soft starter or a VFD the right choice for my pump?
A PSE soft starter controls the start and the stop, then bypasses and runs the motor across the line at full speed. That's what you want when the problem is inrush current, water hammer, or mechanical shock at startup, and the motor otherwise runs at one speed. If you need to vary speed during operation for flow or pressure control, a soft starter won't do it and you want a drive instead. The built-in bypass is the giveaway: once up to speed, the PSE is out of the circuit.
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Does the ABB PSE37-600-70 come with a warranty?
Absolutely. The ABB PSE37-600-70 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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