... change-over radius 过渡区半径 change-over relay 切换继电器 change-over switch 切换开关，转换开关 ...
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前端采集插头接收测试数据，切换继电器电路传递被测电路板信号。
Testing data is received with data acquisition plug, signal from tested circuit board is transferred by circuit of switch relay.
许多矩阵切换系统采用了三极保护继电器和配线。
Many matrix switching systems use three-pole guarded relays and wiring.
如果切换电流太高，造成的温度升高和接触电弧将会劣化继电器并缩短接触寿命。
If the switched current is too high, the resulting temperature increase and contact arcing will degrade the relay and shorten the contact life.
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