一个称为倚藕旁从的机构将 CT、VT 输入通道回路配置为测量子系统。在 C60 系列继电器的说明中，信号源指电流电压信号的各种逻辑组合，也就是一个信号源包含所在测量特定电力设备中的负荷或故障量时需要的信号。一个给定的源可能包括以下信号：三相电流，单相接地电流，三相电压和用来检同期的由单个 VT 提供的附加电压。
ABB ROCOTICS DSQC 252 SAFETY BOARD PCB 3HAA 2563-ALA/2
FANUC ROBOTICS I/O BOARD PCB A16B-2200-0956/05A
REXROTH LT304 SERVO AMPLIFIER FOR TIGHTENING SYSTEM 0 6
SCHNEIDER MODICON TSX PREMIUM 12 SLOT RACK TSXRKY12EX
FANUC A290-7313-Y405 GEAR, NNB
SCHNEIDER MODICON TSX PREMIUM 12 SLOT RACK TSXRKY12EX
ENDRESS HAUSER DB51A-AG31FB31EE10 PRESSURE SENSOR W/ CO
MAC DMB-DDAP-2DM1 SOLENOID PILOT VALVE, 24 VDC, 5.4 W 1
INGERSOLL-RAND ANALOGIC 93817393 SINGLE CHANNEL METER,
ALLEN BRADLEY HIGH RESOLUTION ISOLATED ANALOG INPUT MOD
POWER-ONE 15V 52A DUAL OUTPUT SWITCHING DC POWER SUPPLY
ALBRIGHT SW84B-4 CONTACTOR, LOT OF TEN, NIB
ALLEN BRADLEY CMOS RAM MEMORY MODULE 1775-MR4 REPAIRE
ALLEN BRADLEY SIZE 3 REVERSING STARTER 505-DOD SER. B
FANUC A290-7212-X212 GEAR NNB
WHEDCO SERVO MOTOR CONTROLLER CMC-0001-1-B
