Product Overview

The ABB 1SFB573002D1000​ is a 60 A in-line soft starter belonging to ABB’s PST / 1SFB 573 family—the mid-range, panel-mount soft-starter line positioned between the compact PSR (basic ramp) and the heavy-duty PSTB (bypass-integrated, higher current) tiers. While ABB’s larger soft starters (PSTB 470/570/720) carry internal bypass contactors and live in dedicated cubicles, the ABB 1SFB573002D1000​ is built as a “self-contained in-line” unit: three thyristor pairs in antiparallel, a heatsink stack with natural convection (no fan), and a front fascia that carries either a rotary-potentiometer interface or a keypad LCD depending on the sub-variant, all within a 160 × 260 × 196 mm / ~5 kg envelope that bolts directly to the panel DIN section or the cubicle subplate.Rated for 400–690 V AC operational voltage and a 100–250 V AC control supply (wide-range, tolerant of control-transformer variance), the ABB 1SFB573002D1000​ targets the 60 A motor class—typically 30–45 kW at 400 V, scaling upward at 690 V—where direct-on-line (DOL) starting would hammer the mechanical train (pump couplings, fan impellers, conveyor gearboxes) and where a full VFD is economically or functionally over-specified (constant-speed duty, no regen, no tight speed-hold requirement). The starter’s job is textbook soft-starter logic: ramp the thyristor firing angle from an adjustable initial voltage (30–70% of line) up to full over a configurable 0.5–60 s window, limit starting current to 2–8× rated via the internal current-limit algorithm, then—on units fitted with bypass signalling—release to a downstream contactor or invite the plant to land its own bypass contractor on the starter’s “run” relay output.Because the ABB 1SFB573002D1000​ is a model-specific PST-family spare rather than a configurable universal starter, the thyristor pairing, heatsink geometry, control-board firmware and auxiliary I/O map (2 DI at 24 V DC, relay outputs for “run / fault / bypass-request”) are pre-aligned to the 60 A / 400–690 V envelope. For maintenance teams this means a like-for-like swap restores the motor-starting profile exactly as the original electrical drawing specifies—no re-ramping on a VFD, no re-marshalling the bypass contactor coil, no change to the panel cutout. For panels where the ABB 1SFB573002D1000​ serves as the single-sourced starter on a critical pump or compressor, keeping one spare on the shelf is typically far cheaper than engineering a VFD retrofit around a discontinued PST cutout.

Technical Specifications

Main Features and Advantages

Thyristor in-line with no internal bypass clutter: The ABB 1SFB573002D1000​ runs the motor current through its own antiparallel thyristor pairs for the entire start ramp, then—depending on panel design—either the plant lands a separate bypass contactor downstream (cheapest path) or the starter signals “run” via its relay output and the bypass pulls in externally. This in-line architecture keeps the starter compact (5 kg, 160 mm width) and avoids the cost/space of an integrated bypass contactor that the PSTB class carries. For panels where a separate ABB AF contactor is already specified as bypass, the ABB 1SFB573002D1000​ is the right fit—no duplicated contactor, no wasted DIN rail.Current-limit that actually protects the coupling: The adjustable 2–8× In current ceiling is the feature that sells the starter to mechanical teams. A 60 A motor DOL-starting can pull 6–8× In for several seconds, which hammers pump couplings, fan impeller keys, and conveyor gearbox teeth—especially on high-inertia loads where the acceleration phase lingers. The ABB 1SFB573002D1000​ clamps that ceiling via thyristor firing-angle control, and because the ramp (0.5–60 s) and initial voltage (30–70%) are independently adjustable, the starter can be tuned for “soft mechanical” (low initial V, long ramp) vs. “quick restart” (higher initial V, short ramp) on the same panel depending on duty. Pump applications particularly benefit—setting the ramp to match the pipe-fill rate avoids the “water-hammer” surge that DOL creates when the check valve slams at full speed.Natural convection = no fan = no fan failure mode: At 60 A the ABB 1SFB573002D1000‘s heatsink stack is sized so that ambient airflow inside a reasonably ventilated cubicle is enough—no forced fan, no fan bearing, no “starter tripped on fan fail” alarm during a July heatwave. The ~89% efficiency figure reflects that there’s no fan drag and thyristor conduction loss is the dominant term. For dusty environments (cement, grain, mining) this is a meaningful reliability edge over fan-cooled competitors—the ABB 1SFB573002D1000​ doesn’t suck dust into its own cooling path.Diagnostics that talk back: Depending on the sub-variant (keypad-LCD vs. potentiometer-only fascia), the ABB 1SFB573002D1000​ offers LED status for “run / fault / overtemperature” at minimum, scaling up to LCD parameter readout and fault-code history when the keypad version is specified. The built-in protection set covers overload (I²t curve), phase unbalance / phase-loss, short-circuit on the load side, and internal heatsink overtemperature—four fault classes that between them catch the vast majority of “why did the pump not start” tickets. The 2 DI (24 V DC) typically land “remote start” and “enable” from the plant DCS; the relay outputs (Run / Fault / Bypass-request) propagate back to the DCS so the control room knows the starter state without a VFD protocol layer.Communication scalability: While the base ABB 1SFB573002D1000​ speaks via hardwire DI/relay, ABB’s PST family supports FieldBusPlug piggybacks (Modbus RTU, Profibus DP) on the control-board header—useful when the panel is being modernised and the plant wants starter-state visibility on the SCADA without running six extra cores for Run/Fault/Bypass. For a 60 A starter this is an optional layer; the hardwire baseline is usually enough, but it’s there when the retrofit calls for it.

Application Field

The ABB 1SFB573002D1000​ (60 A, 400–690 V) is deployed wherever a 30–45 kW-class motor (at 400 V; scaling upward at 690 V) needs smooth starting but does not justify a full VFD. The classic catchment splits across three duty types:

• Pumps​ (centrifugal, boiler feed, cooling-water circulation, irrigation lift): the adjustable ramp + 30–70% initial voltage lets the panel engineer match the start profile to the pipe-fill rate, avoiding water-hammer on long penstocks or on the check-valve slam. The ABB 1SFB573002D1000​ here typically sits upstream of a bypass contactor (ABB AF 63 or AF 96) that pulls in once the ramp completes, so the thyristors conduct only during the 5–30 s start window and the pump runs on clean contactor mains the rest of the shift.
• Fans and centrifugal compressors​ (HVAC plant fans, cooling-tower fans, mill ventilation, screw-compressor unload starts): high-inertia loads where DOL would jerk the impeller and the belt drive; the ABB 1SFB573002D1000​ stretches the ramp to 30–60 s so the inertia builds smoothly. Current-limit at 3–4× In is typical on fan duty.
• Conveyors, mixers, agitators, crusher-feed belts: constant-torque loads where the start current spike is the problem, not the speed regulation. The ABB 1SFB573002D1000​ clamps the spike, the motor runs at line frequency thereafter, and the plant avoids VFD cost on a machine that never needs variable speed.

Industries: water/wastewater lift stations, HVAC central plants, food & beverage process lines (CIP pump skids, mixer drives), light mining (dewatering pumps, conveyor feeders), agriculture (irrigation pumps, grain elevator augers). In almost every case the选型 logic is the same: motor is 60 A class, duty is constant-speed, DOL is too violent, VFD is too expensive—ABB 1SFB573002D1000​ sits exactly in that gap.