G6S-2-3VDC G6S24.5DC G6S-2-4.5V G6S-24.5VDC G6S-2-4.5VDC G6S-2-4.5VDC 通信继电器 G6S245DC G6S-2-48V G6S-248VDC G6S-2-48VDC