250kw-400kw Built-In Bypass Soft Starter
NR1000 series 250kW~400kW super high power heavy-duty built-in bypass soft starter is flagship large-current motor control equipment of Zhejiang Xinhang Electric, developed for 380V ultra-high power three-phase asynchronous motors in heavy industrial fields. Adopting large-size high-current thyristor modules and reinforced vertical forced air cooling structure, this power segment reserves complete independent terminals:…
NR1000 series 250kW~400kW super high power heavy-duty built-in bypass soft starter is flagship large-current motor control equipment of Zhejiang Xinhang Electric, developed for 380V ultra-high power three-phase asynchronous motors in heavy industrial fields. Adopting large-size high-current thyristor modules and reinforced vertical forced air cooling structure, this power segment reserves complete independent terminals: 3 programmable relays, isolated RS485-GND shielding terminal, 4-20mA analog output, and multi-group switch input points for emergency stop, start/stop control. The built-in large-capacity bypass contactor minimizes continuous running heat loss, avoids cabinet overheating shutdown for 24h non-stop heavy load equipment, and supports Modbus RTU centralized DCS control for large industrial parks, mines and water conservancy hubs.
- Full Independent Isolated Terminal Layout: Separate RS485-GND shielding ground terminal for anti-electromagnetic interference in high-current industrial sites; independent 4-20mA positive/negative terminals, 3 multi-function programmable relays, dedicated instant stop/start/stop public terminals
- Reinforced Heavy-Duty Heat Dissipation Structure: Large-flow forced air cooling channel, multi-layer heat sink design, stable operation under long-term full load, effective for high-temperature mining and power plant workshops
- Ultra-High Current Short Circuit Protection: Adjustable quick break time ≤0.1s, rapidly cut high-current short circuit fault to protect expensive super high-power motors and thyristor modules
- Multi-Scenario Adaptive Startup Modes: 4 start curves (fixed test / voltage ramp / constant current / current ramp), auto boost startup torque for ultra-high inertia loads like large mine fans and deep well main pumps
- Comprehensive Full-Range Motor Protection: 12 professional protective functions covering all operation stages (soft start, bypass full voltage, soft stop); adjustable current imbalance trip threshold 5%~100%, prevent three-phase current deviation damage of large motor windings
- Industrial-Grade Modbus RTU Communication: Shielded wiring supported via RS485-GND terminal, realize remote centralized monitoring, fault upload, batch parameter setting for multi-unit soft starter groups in large control rooms
- High Precision 4-20mA Analog Output: 0.5% linear accuracy, 4mA zero-point calibration function, real-time upload full-load motor current to industrial DCS monitoring system
- Large-Capacity Fault Data Storage: Retain locked voltage/current/phase sequence data at fault moment, bilingual LCD screen support historical fault record query for convenient maintenance of super high-power equipment
| Project Name | Performance Metrics | |
| Scope of application | 3-phase squirrel cage asynchronous motor | |
| Power range | 3kW~22kW (380V mini type), 30kW~400kW (380V conventional type) | |
| Rated voltage | 380V(±20%) | |
| Rated frequency | 50/60Hz ±5% | |
| Overload capacity | ≤22kW: 300% 30 seconds, 120% continuous; >22kW: 400% 60 seconds, 120% continuous | |
| Control power supply voltage | The 380V model does not require an external control power supply | |
| Adjustable current multiplier | 1–5 times | |
| Soft start time | 1 to 90 seconds | |
| Module operation mode | Long-term | |
| Cooling method | Forced air cooling | |
| Secondary interface terminal | Discrete input | 3 routes |
| Relay output | ≤115kW: 1-channel (programmable); >115kW: 3-channel (programmable) | |
| 4-20mA | ≤22kW: None; >22kW: 1 channel (optional) | |
| RS485 | ≤22kW: 1 channel; >22kW: 1 channel (optional expansion) | |
| Protection | Short circuit quick break, overcurrent, overheating protection, inverse time overload, voltage phase loss, phase unbalance, instant stop, undervoltage, overvoltage, underload, startup failure, phase sequence error | |
| Host overload protection | Overload inverse time limit, optional levels 1–6 | |
| Host current imbalance protection | Unbalanced tripping standard: 5-100% for any two phases | |
| Unbalanced trip delay: 1-60 seconds adjustable | ||
| Host short-circuit protection | Quick break time: ≤ 0.1S, adjustable | |
| Bus function | Interface: RS485; Protocol: Modbus RTU | |
| Human-machine interface | 4-line COG screen | |
| Language | Chinese, English | |
| specifications and models | External dimensions (mm) | Installation size (mm) | ||||
| W1 | H1 | D | W2 | H2 | Φ | |
| 5.5KW-22KW | 60 | 165 | 145 | 55 | 155 | m4 |
| 30KW-37KW | 110 | 250 | 162 | 85 | 220 | m5 |
| 45KW-75KW | 140 | 270.5 | 139.5 | 110 | 245 | m6 |
| 90KW-115KW | 210 | 340 | 185 | 210 | 315 | m8 |
| 132KW-200KW | 280 | 610 | 200 | 232 | 540 | m8 |
| 250KW-400KW | 332 | 725 | 246 | 282 | 640 | m10 |
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