コンタクタ,サーキットブレーカー,ソーラーインバーター,電気メーター,太陽電池
- Core Distinction in One Sentence
中間リレー: Transmit signals, carry low current, serve as signal transfer station
コンタクタ: Drive loads, carry high current, control motors
- Intuitive Comparison
- 電流容量
中間リレー: Max 6~10A, only for low current circuits
コンタクタ: 10A up to thousands of amperes, applicable to high-power equipment
- 主な用途
中間リレー: PLC signal conversion, multi-circuit wiring, circuit interlocking, contact expansion
コンタクタ: Directly control high-power loads such as motors, ウォーターポンプ, fans and heating tubes
- Contact Difference
中間リレー: Equipped with only small contacts without main/auxiliary distinction, large quantity of contacts
コンタクタ: Composed of high-current main contacts and low-current auxiliary contacts; main contacts are specially designed for load current transmission
- Arc Extinguishing Performance
中間リレー: Without arc shield, incapable of breaking strong electric arc
コンタクタ: Built-in arc shield to extinguish electric arc during power-off and prevent contact burnout
- サイズ & 価格
中間リレー: Compact and low-cost, densely installed in control cabinets
コンタクタ: Larger in size and higher in price
- Coil Working Principle
They share the same working principle: Low-current coil pulls in to control contact on-off.
The only difference lies in the maximum current bearing capacity of contacts.
- Practical Selection Rules
Use intermediate relays for weak current signal conversion
Use contactors for start-stop control of high-power motors
Add intermediate relays to expand contacts when auxiliary contacts of contactors are insufficient
- 典型的なアプリケーションシナリオ
Low signal switching inside control cabinets: RXM series intermediate relays
Start-stop control of 380V motors: AC contactors are mandatory
