1.产 品 资 料 介 绍：
- 安装 Mitsubishi NF1250-SEW 需选用匹配安装支架，固定扭矩控制在 180-220N・cm，确保安装面平整无振动。
- 接线前确认系统电压与 NF1250-SEW 额定绝缘电压（690V）匹配，避免超压损坏内部脱扣机构。
- Mitsubishi NF1250-SEW 为 3P 极数设计，适配三相电路，严禁接入单相负载或违规改接极数。
- 主回路接线需选用铜排或≥50mm² 铜导线，端子紧固后需检查接触电阻，避免发热导致 NF1250-SEW 跳闸。
- 定期清洁 NF1250-SEW 的操作手柄与端子排，用干燥毛刷清除灰尘，防范接触不良影响分合闸动作。
- 运行环境温度控制在 - 5℃至 + 40℃，湿度 5%-95%（无凝露），适配其工业级使用环境要求。
- Mitsubishi NF1250-SEW 的电子脱扣器需按负载特性设定过载电流（600-1250A 可调），避免保护失效。
- 分合闸操作时需确保 NF1250-SEW 处于无负载状态，禁止带负荷强行合闸，保护操作机构寿命。
- 接线端子采用螺栓紧固方式，多股导线需压接专用铜鼻子，单股导线剥线长度 8-10mm，无毛刺。
- 模拟量信号接线需远离主回路电缆（间距≥30cm），减少电磁干扰对 NF1250-SEW 脱扣器的影响。
- 定期检查 Mitsubishi NF1250-SEW 的短路分断能力适配性，确保系统短路电流不超过 85kA（400VAC 下）。
- 接地系统需可靠：通过≥16mm² 黄绿双色线连接接地排，接地电阻≤4Ω，符合 IEC 60947-2 标准。
- 禁止用工具撬动 NF1250-SEW 的脱扣器盖板，避免损坏电子保护模块或改变预设保护参数。
- 长期运行后，每 12 个月用 500V 兆欧表检测绝缘电阻（主回路≥10MΩ），同时校验脱扣器动作精度。
- 闲置超过 6 个月后重启，需手动分合闸 3-5 次磨合机构，再空载通电预热 30 分钟，确认 NF1250-SEW 无异常后带载运行。
NF1250-SEW塑壳断路器 英文资料：
The installation of Mitsubishi NF1250-SEW requires the use of a matching mounting bracket, with a fixed torque controlled between 180-220N · cm to ensure a flat and vibration free installation surface.
Before wiring, confirm that the system voltage matches the rated insulation voltage (690V) of NF1250-SEW to avoid overvoltage damage to the internal trip mechanism.
Mitsubishi NF1250-SEW is designed with 3P poles and is compatible with three-phase circuits. It is strictly prohibited to connect single-phase loads or illegally change the number of poles.
The main circuit wiring should use copper bars or copper wires with an area of ≥ 50mm ². After tightening the terminals, the contact resistance should be checked to avoid heating and causing NF1250-SEW to trip.
Regularly clean the operating handle and terminal block of NF1250-SEW, use a dry brush to remove dust, and prevent poor contact from affecting the opening and closing actions.
The operating environment temperature is controlled between -5 ℃ and+40 ℃, with a humidity of 5% -95% (no condensation), suitable for its industrial grade use environment requirements.
The electronic release of Mitsubishi NF1250-SEW needs to set the overload current (600-1250A adjustable) according to the load characteristics to avoid protection failure.
During the opening and closing operation, it is necessary to ensure that NF1250-SEW is in a no-load state, and it is prohibited to forcefully close it with load to protect the service life of the operating mechanism.
The terminal block adopts bolt fastening method, and multi strand wires need to be crimped with special copper noses. The stripping length of single strand wires is 8-10mm, without burrs.
Analog signal wiring should be kept away from the main circuit cable (with a spacing of ≥ 30cm) to reduce the impact of electromagnetic interference on the NF1250-SEW release.
Regularly check the short-circuit breaking capacity adaptability of Mitsubishi NF1250-SEW to ensure that the system short-circuit current does not exceed 85kA (at 400VAC).
The grounding system must be reliable: connected to the grounding bar through a yellow green dual color wire of ≥ 16mm ², with a grounding resistance of ≤ 4 Ω, in accordance with IEC 60947-2 standard.
Do not pry open the release cover of NF1250-SEW with tools to avoid damaging the electronic protection module or changing the preset protection parameters.
After long-term operation, use a 500V megohmmeter to test the insulation resistance (main circuit ≥ 10M Ω) every 12 months, and verify the accuracy of the release action.
After being idle for more than 6 months and restarting, the mechanism needs to be manually opened and closed 3-5 times for running in, and then preheated with no load for 30 minutes. After confirming that NF1250-SEW is normal, it can be operated with load.
Summary: The stable operation core of Mitsubishi NF1250-SEW molded case circuit breaker lies in standardized installation, compliant wiring, precise parameter setting, and regular maintenance. Its 1250A rated current and 85kA high short-circuit breaking capacity are suitable for the overload and short-circuit protection requirements of industrial distribution systems. Strictly following the operating specifications can fully leverage its high reliability advantages and ensure the safe and stable operation of the power system.
NF1250-SEW塑壳断路器 产品展示
产品视频
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The content is from Ruichang Mingsheng Automation Equipment Co., LTD
Contact: +86 15270269218
