Application Scenarios

At a regional water utility’s lift-station MCC, three 90 kW submersible pumps were DOL-started through 160 A ABB Tmax XT3 breakers (the 1SDA064796R1​ control switch from our earlier description sat on those same breakers). Every start pulled ~700 A inrush — six times full-load — and the repeated torque spikes were cracking the pump coupling inserts every 14–18 months. The utility’s first quote was three VFDs at ~€3 k each plus panel rewiring for 4–20 mA speed commands the SCADA didn’t even need. The station superintendent pushed back: “We don’t vary speed, we just need softer starts.” The fix: three ABB 1SFB573002D1000​ units, one per pump, landing in the same MCC footprint the DOL contactors vacated. Ramp-up set to 5 s, initial voltage at 40 %, bypass kicks in at ~95 % speed. Inrush dropped to ~220 A, coupling insert life stretched past 36 months, and the MCC room ran cooler because the 1SFB573002D1000‘s built-in bypass means the thyristors only conduct during the first few seconds — no continuous switching losses like a VFD. The retrofit paid for itself in coupling savings alone inside nine months. This is the 1SFB573002D1000‘s sweet spot: when “softer start/stop” is the requirement, not “variable speed.”

Parameter

Main Parameters	Value/Description
Product Model	1SFB573002D1000​
Manufacturer	ABB
Product Category	In-Line Soft Starter (PST/PSTB family)
Rated Operational Voltage	380–480 V AC, 3-phase
Rated Operational Current (Ie)	120 A (in-line connection)
Control Supply Voltage (Us)	230 V AC
Initial Voltage at Start	30–70 % adjustable (kick-up setting)
Ramp Time	Adjustable via DIP/potentiometer (typical 1–20 s range, model-dependent)
Bypass	Internal bypass contactor (auto-transfer at ramp completion)
Motor Rotation	Forward & Reverse capable (wiring-dependent)
Operating Temp / Protection	IP20 cabinet-mount; -20 °C to +60 °C ambient
Dimensions (L×W×H)	~200 × 300 × 350 mm (variant-dependent)
Net Weight	~15 kg
Certifications	CE / CCC / UL (per ABB low-voltage soft starter family)

 

Note: The 1SFB573002D1000 is an ABB spare/order code from the PST/PSTB-era catalog. Exact ramp range, display type, and communication options (some PSTB units carry Modbus/Profibus) depend on the specific 1SFB57 sub-suffix. Cross-check your motor FLC and supply voltage before ordering — 120 A inline assumes the starter sits in the main run (not delta-internal, which would rate higher).

Technical Principles and Innovative Values

• Innovation Point 1: Thyristor Ramp with Automatic Bypass.​ The 1SFB573002D1000​ uses back-to-back SCRs on each phase to phase-angle-control the applied voltage during start and stop. Once the ramp completes, an internal electromechanical bypass contactor closes and the thyristors stop firing — the motor runs straight off the line through the contactor. This means the 1SFB573002D1000​ runs cool (thyristors only conduct ~5–10 s per start), unlike a VFD which switches continuously and needs a heatsink/fan. In a packed MCC, that thermal discipline matters.
• Innovation Point 2: Adjustable Kick-Up Voltage (30–70 %).​ Many commodity soft starters force a fixed 40 % initial voltage — too low for a loaded conveyor (won’t break static friction), too high for a centrifugal pump (still slams the pipe). The 1SFB573002D1000​ lets you dial 30–70 % to match the load profile: 30–40 % for pumps/centrifugal, 50–70 % for compressors/crushers with high breakaway torque. One pot, one setting, no firmware.
• Innovation Point 3: Diagnostic Visibility Without a Communications Card.​ Even in its base configuration, the 1SFB573002D1000​ monitors overcurrent, phase imbalance, and thyristor fault conditions, and can drive a simple NO/NC status contact to the panel’s PLC (land it on the same 24 V DI slice the 1SDA064796R1​ breaker aux feeds — keeps the MCC schematic clean). Higher-spec siblings in the PSTB line add LCD + Modbus, but the 1SFB573002D1000​ covers 80 % of plants that just want “did it start, is it bypassed, did it trip” telemetry.

 

Application Cases and Industry Value

A crushed-stone quarry running a 110 kW jaw-crusher drive off a DOL starter was popping the upstream 160 A fuse every third cold start — the inrush + crusher’s high breakaway torque was spiking to ~780 A on a 3×FLC motor. The site electrician’s first instinct was “bigger fuse,” but that just moves the failure to the motor windings. The fix: a ABB 1SFB573002D1000​ set to 6 s ramp, 60 % initial voltage (crusher needs the kick to break static rock bite), and the internal bypass carrying the running current. First cold start post-retrofit: inrush ~260 A, fuse stayed happy, and the crusher’s coupling hubs — which had been bruising every 12 months — went 28 months before the next visual check. The quarry superintendent’s note: “Should’ve done this five years ago instead of buying couplings.”In a second case, a food-processing chiller plant (matching ABB’s Tassal salmon-hatchery case story from the catalog) had four 75 kW refrigerant compressors DOL-started, causing the site’s 480 V bus to dip 8–10 V on each start — enough to nuisance-trip the nearby packaging-line VFDs. Dropping ABB 1SFB573002D1000​ units on the compressors (stagger the ramps 10 s apart) killed the bus sag, and the packaging line stopped blinking. The plant manager’s math: one 1SFB573002D1000​ at ~€800 vs. one packaging-line VFD restart at ~€3 k in lost product — easy call.

Related Product Combination Solutions

The 1SFB573002D1000​ sits in a panel with these natural ABB companions:

• ABB Tmax XT2 / XT3 MCCB (e.g., 1SDA067967R1, 1SDA064796R1)​ – The upstream breaker protecting the 1SFB573002D1000​ and motor; size the breaker at ~1.25× the 120 A rating (XT3 160 A typical).
• ABB PSR / PSE / PSTX series​ – The broader ABB soft starter family; PSTX is the current-gen successor with torque control + pump clean + Modbus. If the 1SFB573002D1000​ is end-of-life in your region, PSTX570-600-70 (120 A, 480 V) is the near-drop-in.
• ABB AF series contactors​ – If you prefer external bypass (instead of the 1SFB573002D1000‘s internal one) for easier contactor单独更换, pair the AF146 (120 A) as the bypass and use the soft starter in “no internal bypass” config.
• ABB S200 MCBs​ – The 230 V AC control circuit feeding Us on the 1SFB573002D1000​ typically taps off a 10 A S201 C-curve on the same DIN rail.
• ABB 1KHL178016R0001F PSM03​ – The 24 V DC 10 A PSU (from our earlier description) that feeds the panel’s PLC and the 1SDA064796R1​ breaker aux — the same 24 V rail can pick up the 1SFB573002D1000‘s status contact for “Bypassed / Fault” telemetry.
• ABB PSTB570 / PSTB600​ – The PSTB-series siblings that share the 1SFB57 catalog prefix; if your 1SFB573002D1000​ needs a communicable upgrade, PSTB600 adds LCD + Modbus for the same 120 A frame.