触点组合形式和触点组数应根据被控回路实际情况确定。动合触点组和转换触点组中的动合触点对，由于接通时触点回跳次数少和触点烧蚀后补偿量大，其负载能力和接触可靠性较动断触点组和转换触点组中的动断触点对要高，整机线路可通过对触点位置适当调整，尽量多用动合触点。
根据负载容量大小和负载性质（阻性、感性、容性、灯载及马达负载）确定参数十分重要。认为触点切换负荷小一定比切换负荷大可靠是不正确的，一般说，继电器切换负荷在额定电压下，电流大于100mA、小于额定电流的75%**。电流小于100mA会使触点积碳增加，可靠性下降，故100mA称作试验电流，是国内外专业标准对继电器生产厂工艺条件和水平的考核内容。由于一般继电器不具备低电平切换能力，用于切换50mV、50μA以下负荷的继电器订货，用户需注明，必要时应请继电器生产厂协助选型。
继电器的触点额定负载与寿命是指在额定电压、电流下，负载为阻性的动作次数，当超出额定电压时，可参照触点负载曲线选用。当负载性质改变时，其触点负载能力将发生变用。
BENTLY NEVADA 78462-01
OKUMA E4809-045-174 PC BOARD W/MULTIPLE COMPonENTS FUB-P4M4, 1911-2241-111.693
ALLEN BRADLEY 634488-90 PC BOARD ASSEMBLY 7300-UPK3
FOXBORO C0143AH PEN
ALLEN BRADLEY 1775-MED ERROR CORRECTING RAM MEMORY 128K 966054 01
YOKOGAWA 4153-555/BU/AK-04/REM/PS/YCA
FANUC A06B-6058-H005 SERVO AMPLIFIER AC DRIVE W/ A20B-1003-0090/02/07B
INCLUDES A20B-1003-0081/02A
ANDERSON INSTRUMENT 56000-449 REV C
BRANSON 900 MWC MULTIPLE WELDER ConTROLLER EDP NO. 201-143-078 117 VAC 50/60HZ
PACIFIC SCIENTIFIC PC800 MODEL: CU833-002
HORNER ELECTRIC HE800HSC601B
HORNER ELECTRIC HE800HSC601B
GIDDINGS & LEWIS 502-02833-20 INTERFACE MODULE 501-03206-00
HonEYWELL 620-3691
POLYSPEDE FSC-300 ADJUSTABLE SPEED DRIVE SYSTEM SC SERIES 3HP 230VAC 1PH
ConTROL TECHNOLOGY 901B-2550
TEXAS INSTRUMENTS 500-5114A REMOTE base RS485
ALLEN BRADLEY 1746-A7 7-SLOT RACK SER. B WITH 1746-P2
GE FANUC A20B-9000-0710/08A SERIES SIX CPU TYPE: A20B-9000-0710
YAMAHA G776420 PC
RELIANCE ELECTRIC 107172-001R 0-48652 84543-108A
RELIANCE ELECTRIC 107172-001RT BOARD 107172001RT 84543-108A 0-48652
BANNER USE2424YP2 MICRO-SCREEN LIGHT CURTAIN 24INCH
VICKERS ASSY. 732 367 BOARD EG-09010, 732367, EG09010
ABB YB560103-BD/1 I/O MODULE DSQC 223
GOULD MODICON AS-B571-001
RAYTEK INC. RAYNGER PM 6T101 TEMPERATURE SENSOR 48920
BANNER MINI-SCREEN LIGHT CURTAINS MSE824Y EMITTER, MSR824
ALLEN BRADLEY 154959 REMOTE I/O PC BOARD REV 05 1336MODG2/D
NIB SAFTRonICS CIMR-PCU21P5 PC3 INVERTER DRIVE CIMRPCU21P5, 3PH 200-230VAC 7.2A
PRESSTECH PART: 7508-0810-01 PANEL DRIVER BOARD ASSY: 7508-0820
BURTON 513-215-100 PC BOARD PS1100 BRV D DRV C ECI-B-6
BURTON 513-149-200 POWER BOARD REV * 0000000 COMP NO. 413-158-000
ELECTROCRAFT 2405 COMPARATOR 115V, 2.1A, 1/12HP, 1PH, 1725RPM
REPAIRED ANDOVER ConTROLS SCX-920 INFINITY SYSTEMS ConTROL BOARD 05-1000-697 R.D
SOLIDSTATE ConTROLS 80-219325-90 CIRCUIT BOARD 70-411937-90 REV. B
GENERAL ELECTRIC 58CD56ND91 AC MOTOR 1/2HP, 1725RPM, 180/200V W/OUT KEY
CHROMALOX 2001-10201
NIB HonEYWELL 620-0056
MICROTROL DC00006-501
NIB ALLEN BRADLEY S50387 MODULATOR LOGIC ConTROL BOARD REV M 50387
FESTO DNCE-32-100-BS3 ACTUATOR ELECTRIC CYLINDER DNCE-32-100-BS
NIB TELEMECANIQUE XBT MEM16 MEMORY CARD 16 MO 034833 PRETEC PAJ016AS4
GE FANUC IC600YB930A PROTECHED 115VAC
ORIENTAL MOTOR VEXTA 4GD5K GEAR HEAD W/ KBLM460GD-CM AC
REPAIRED GENERAL ELECTRIC 6VFW2100 STATOTROL II DRIVE 6VFWC2100A4
ISHIDA P-5285B EXC