PSTB370-600-70 Softstarter 600V AC 200kW In-Line 355kW Delta Bypass

Product Overview

• PSTB370-600-70 – Softstarter for heavy-duty motor control
• Main circuit 208‑600 V AC, control supply 100‑250 V AC
• Rated operational current (in-line): 370 A
• Inside delta connection: up to 640 A / 450 kW (500 V)
• Integrated electronic overload & 115 % service factor
• Starting capacity: 3×Ie for 15 seconds
• Compact dimensions: 366×460×361 mm, 31 kg

Key Technical Data

• Brand: ABB (legacy PSTB series)
• Model: PSTB370-600-70 · ID: 1SFA894015R7000
• Rated operational voltage: 208…600 V AC (50/60 Hz)
• Control supply: 100…250 V AC / 24 V DC option
• Rated power (in-line): 200 kW (400 V) · 257 kW (500 V)
• Inside delta power: 355 kW (400 V) · 450 kW (500 V)
• Current limit range: 1.5…7×Ie
• Initial voltage: 30…70 % (start), 100…30 % (step-down)
• Ramp time: 1…120 s
• Duty cycle: 10 starts/h @ 3.5×Ie / 7 s (50% ON/OFF)
• Analog outputs: 0‑10 V, 0‑20 mA, 4‑20 mA

Built‑in Protection & Diagnostics

• Electronic overload protection (integrated)
• Fault, overload, run, and bypass signal relays
• LED indication: Ready (green), Protection (yellow), Fault (red)
• Communication: FieldBusPlug (standard)

Environmental & Installation

• Ambient temperature: 0…+50 °C (operation) · -25…+70 °C (storage)
• Protection degree: IP00 (main terminals)
• Main terminals: Bars, hole Ø10.5 mm, 25×6 mm
• Control terminals: Rigid 1×2.5 mm² or 2×1.5 mm²
• Tightening torque: 35 N·m (main) · 0.5 N·m (control/supply)

Compliance & Certifications

• CE Declaration: 1SFA1-76
• RoHS: 1SFC132035D0201
• ETIM 9: EC000640 · eClass V11.0: 27370907
• WEEE: B2B category 5 (≤50 cm)

Mounting & Commissioning

• Simple bar‑type main connections, clearly marked terminals
• Control circuit wiring with rigid conductors (2.5 mm² max)
• Integrated bypass reduces heat, extends component life
• Quick‑start menu via FieldBusPlug or internal potentiometers
• All settings accessible without additional software

Compatibility

• Compatible with standard 3‑phase asynchronous motors
• In‑line or inside‑delta connection (switch selectable)
• Works with 50/60 Hz networks, no derating required
• FieldBusPlug allows Profibus, DeviceNet, or Ethernet adapters

What’s in the Box

• PSTB370-600-70 softstarter unit
• Mounting hardware & terminal bars
• Quick start guide (paper)
• Data sheet 1SFC132005C0201 (digital download)

Warranty & Shipping

• 12‑month warranty against manufacturing defects
• Shipping: 12‑24 hours dispatch (working days)
• Carriers: FedEx, UPS, DHL – worldwide express

Expert Review – Engineer’s Insight

• “The PSTB370 handles severe starts with ease. The built‑in bypass and overload protection reduce panel space and external components. Perfect for pumps, fans, and conveyors.” – Senior Application Engineer

Manager’s Insight

• “From a reliability and cost perspective, this softstarter is a solid choice. Its inside‑delta capability doubles the output power without upsizing the device – a smart investment for expanding production lines.” – Product Manager

Typical Applications

• Centrifugal pumps and compressors
• Conveyor belts and material handling
• Fans, blowers, and HVAC systems
• Mixers, crushers, and mills
• Any heavy‑duty motor requiring reduced starting current

Frequently Asked Questions

• Q: What is the maximum starting current?
  A: 3 times the rated current (3×370 A) for 15 seconds.
• Q: Can I use this for inside‑delta connection?
  A: Yes, switchable. It doubles the output power to 640 A.
• Q: Is an external bypass contactor required?
  A: No, it has a built‑in bypass relay.
• Q: Does it support 24 V DC control?
  A: Yes, control circuit accepts 24 V DC (as well as AC).
• Q: What communication protocols are supported?
  A: FieldBusPlug slot accepts Profibus, DeviceNet, CANopen, or Ethernet.

Practical Tips from Field Service

• Tip 1: For inside‑delta wiring, double‑check the motor terminal configuration – it reduces line current by 42%.
• Tip 2: Set the current limit to 4×Ie for most centrifugal pumps to avoid nuisance tripping.
• Tip 3: Use shielded cables for analog outputs (0‑10 V / 4‑20 mA) to maintain signal integrity in noisy environments.

Selection Guide – Which PSTB Model?

• PSTB370‑600‑70 – 370 A in‑line, up to 640 A inside‑delta
• Choose in‑line for motors up to 200 kW (400 V) or 257 kW (500 V)
• Choose inside‑delta for 355‑450 kW without increasing unit size
• Check starting duty: 10 starts/hour at 3.5×Ie (7 s) is sufficient for most industrial cycles
• Always verify ambient temperature and ventilation – unit is rated 0…+50 °C

Order & Support Information

• Min. order: 1 piece
• Customs tariff: 8503009999
• EAN: 7320500255636
• For quotations or technical support, contact our team:
• 📧 sales@powergearx.com
• 📞 +86 18030005825 (WhatsApp)

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