Todays deals on Single Pole?

Circuit Breaker Box – 5 Single Pole P/N 12307070 NEW! $985.95

Hubbell 20A Single Pole Switch Red NIB CS1221R Lot of 80 $600.00

PARKER 310-1N-NC-WD7P-8 I-FORCE IRONLESS MOTOR, 310 COIL, SINGLE POLE, 8FT CORD $450.00

Reliance Starter Contactor Single Pole 120VAC 50/60Hz 600VDC 78091-R NIB $424.99

ALLEN BRADLEY Z-34042 SINGLE POLE CONTACT SET NIB $375.00

GE Record Plus Circuit Breaker Naval FBN16TE044R2 FBN 347V 45A TE 1 Single Pole $377.00

Keithley 7705 Single-Pole Control Module $350.00

ALLEN BRADLEY Z-34042 SINGLE POLE CONTACT KIT $351.00

airpax dc disconnect 600 amp single pole communications equipment or solar-wind- $325.00

Agilent/HP 8765A Coaxial, single pole, double throw $40.00

NEW Joslyn Clark 110A Single Pole Definite Purpose DC Contactor 5DP3-10100 NIB $339.99

Square D JGL26200 200 Amp Single Phase 2 Pole 240V Circuit Breaker J Frame $339.99

NEW LOT OF 41 CUTLER HAMMER CH CIRCUIT BREAKERS NIB 33 DOUBLE POLE 8 SINGLE POLE $274.99

Merlin Gerin Single Pole Compact F100N MCCB 100 Amp Moulded Breaker 100Amp $235.72

Lot of 9 Breaker Cutler-Hammer GFCB115 circuit breaker single pole 15A $250.00

Allen Bradley Bulletin 709 Size 6 Movable Single Pole Contact X-183155 540A NIB $212.49

square d qo breakers 20 amp single pole $200.00

Lot of 28 Murray Type MP-T 16 Dual 1 Pole Breakers or Equivalent 12 Singles $179.00

New Square D Contact Kit Size 5 1 Single Pole $186.00

19 LEVITON 20A TOGGLE LOCKING SINGLE POLE SWITCH 1121-2L $179.95

28-Siemens L-5538 20 Amp 120/240 Volt Circuit Breakers Single Pole Type BL $175.00

(500) Pass & Seymour P&S Legrand 15 Amp Single Pole Toggle Switch White BLOWOUT! $152.10

MURRAY MP120 20AMP SINGLE POLE BREAKER BRAND NEW 48PK $168.00

Paragon Time Control # 72014-00Z 3 Pole, Single Throw, 120V Timing Motor NIB $179.00

FPE Single Pole GFI 15amp breaker $175.00

GE MAN MOTOR STARTER SINGLE SPEED 1POLE 1HP 10EA 115/230V TAPE 1 CR101Y1 NEW! $170.00

PASS & SEYMOUR SWITCH TOGGLE SINGLE POLE 120V/15A MASTER CASE OF 80PC 660-ICP8 $150.00

6 X UBIZ-2020 UBIZ2020 20 AMP 2 SINGLE POLE ZINSCO R38 CIRCUIT BREAKER NEW $149.99

Lot of 9 Siemens BQD 20 Amp 277 Volt Single Pole Circuit Breakers $150.00

CULTER-HAMMER E50SA LIMIT SWITCH SINGLE POLE NEW IN BOX $122.99

New Federal Pacific/American NEF213070 70A Single Pole Circuit Breaker $149.99

Crabtree 80Amp PowerStar Single Pole MCCB Moulded Case Breaker 80 Amp 7PBGB180 $110.00

X38 HUBBELL SINGLE WALL OUTLET RECEPTACLE HBL546112-POLE 3-WIRE 250V LOT OF 25!! $149.99

15 – NEW DP CONTACTOR 30A 24V Single Pole w/ Shunt 1.5p $149.99

250 LEVITON 15A SINGLE POLE GROUNDING SWITCHES 1451-2A $149.95

Merlin Gerin/Schneider 100 Amp Single Pole MGP1001L1 Compact NS100N 100Amp MCCB $94.28

(39) SQUARE D TYPE QOB Single Pole 20a Breakers $125.00

Lot of (200) Single Pole Switches 15 amp 120/277 volt Standard Toggle White $115.00

New Federal Pacific/American NE117020 20A Single Pole Breaker $129.99

ALLEN BRADLEY Z-34039 SINGLE POLE CONTACT CONTACTOR KIT $134.00

Zenith K-1049 Relay Single Pole Double Throw New $120.00

Lot of 10- New Eaton 8500K1 Single Pole Toggle Switch ON-OFF-ON $119.00

Lutron NTF-10-277-IV Single-Pole Slide Dimmer – Ivory Fluorescent *Free Shipping $130.00

5) Siemens 5SX21-C4 Single Pole Circuit Breaker 5SX21C4 $120.00

FPE Single Pole GFI 20amp breaker $125.00

SB3-D, BASE, NH 3, 630A, SINGLE POLE, FUSE BLOCK, NOS $125.00

Cutler-Hammer E50SA Single Pole Switch Body, Series A2, 1NO-1NC $120.00

6-189-5 CUTLER HAMMER Silver Single Pole Contact Kit $119.00

12 x Single Pole 6kA rated Mini RCBO 30 mA $78.00

General electric TE111020 20amps 125VAC single Pole $100.00

General electric te111020 single pole 20a 125vac $100.00

Federal Pacific NE111020 20A 120VAC 125VDC Single pole $100.00

Federal Pacific 113020 20A 120VAC Single pole $100.00

Cutler Hammer CHSPT2ULTRA Single Pole UL1449 3RD Edition Type 2 SPD $119.95

100 AMP 20 SINGLE POLE LOAD CENTER WITH 5-20 AMP SINGLE POLE BREAKERS $119.59

Furnas 75JG14 Single Pole Contact Kit,Size 4 $110.00

HUBBELL HBL400 M&FM SINGLE POLE PLUG SET RED GRN WHT =6 $99.99

SQUARE D I-LINE HQ0306 ADPTER 6 SINGLE POLE 20 AMP $99.99

DURAKOOL 100 AMP SINGLE POLE MERCURY RELAY MODEL CBC-702 $99.99

Gould Shawmut 60605J 600v 60a Single Pole Fuse Block lot 9x $109.00

Westinghouse JA-225 150 Amp 2 Pole Single Phase 250V A8 De-Ion Breaker $89.00

ONE NEW ALLEN BRADLEY SINGLE POLE SIZE 4 CONTACT KIT PART NUMBER Z-34041 $100.00

NEW INTERMATIC SEVEN-DAY DIAL TIME SWITCH 4 POLE SINGLE THROW T7401B $90.00

(100) P&S 15 Amp Single Pole Toggle Switch White CS15AC1 Commercial Grade CS115w $89.99

AEG EE CONTROLS MBS25-2P-L-S4-AR MANUEL STARTER SINGLE PHASE 2POLE 600V 6-10 AMP $89.90

MOTOR CIRCUIT PROTECTOR 400A 2-Pole HMCP Single-Phase HM2P400X5W / HM2P4XWS10 $102.00

Cutler Hammer FT11P-18 Single Pole Overload Relay – NIB (Lot of 4) $100.00

Leviton 49F53-C 49 Series Single Pole Contact Female $95.00

Lutron NTF-10-WH Single-Pole Slide Dimmer (White) 16A Fluorescent 120V 60 Hz $100.00

NEW Leviton Single Pole Female Rhino Plug 49F53-C $100.00

FEDERAL PACIFIC 125 AMP TYPE NB 120/240V SINGLE PHASE 2 POLE BREAKER $100.00

10 – NEW DP CONTACTOR 30A 24V Single Pole w/ Shunt 1.5p $99.99

6 PACK UBIZ-20 UBIZ20 20 AMP SINGLE POLE ZINSCO Q20 TYPE CIRCUIT BREAKER NEW $84.99

LOT of (27) SINGLE POLE 20 AMP CIRCUIT BREAKERS $79.99

6 PACK CONNECTICUT ELECTRIC UBIZ-20 UBIZ20 20AMP SINGLE POLE CIRCUIT BREAKER Q20 $84.99

(5) Siemens 5SX21-A25 Single Pole Circuit Breaker Lot 5SX21A25 New $90.00

(50) Single pole decorative decora rocker switch $80.00

10 COOPER HEAVY DUTY 20A SINGLE POLE SWITCH 1238-1W BOX $89.95

SQUARE D MO48 (1123) 2X20A-2X50A THERMAL MAGNETIC MULTI-BREAKER SINGLE POLE NEW $82.00

CIRCUIT BREAKERS, SINGLE POLE, LOT OF 95, 20 AMP $79.95

NIB ALLEN BRADLEY Z-34040 SINGLE POLE CONTACT KIT $88.00

Lot of 17 Zinsco single pole breakers, 12 Q120 & 5 Q130, nice used & guaranteed $93.00

GTE Sylvania 200 Amp 2 Pole Circuit Breaker Internal Common Trip Single Handle $85.00

MURRAY MP120 20AMP SINGLE POLE BREAKER BRAND NEW 24PK $84.00

6 PACK CONNECTICUT ELECTRIC UBIZ-30 UBIZ30 30AMP SINGLE POLE CIRCUIT BREAKER Q30 $77.99

6 PACK UBIZ-30 UBIZ30 30 AMP SINGLE POLE ZINSCO Q30 TYPE CIRCUIT BREAKER NEW $77.99

New Allen Bradley Z-34041 Contact Kit Size 4 or 200 Amp, Single Pole $80.00

Allen Bradley Single Pole Contact Kit Z-34041 Size 4 $90.00

8 HUBBEL 20A SINGLE POLE LOCKING SWITCH# HBL 1221L $89.99

MEM AD40B 40A 30MA SINGLE POLE TYPE B RCBO BRAND NEW $78.50

Leviton WSS10-DI Wireless Momentary Switch Single Pole Ivory 120-277 volt $84.56

Eaton/MEM 63Amp Type B Single Pole MCB 63 Amp Circuit Breaker Bill 63A Type 2 $62.85

MEM 63Amp Single Pole MCB Circuit Breaker 63 Amp Type 3/C 631MB3 Bill M6 631 MB3 $62.85

NC020 FEDERAL PACIFIC (Lot of 10) SINGLE POLE 20 AMP CIRCUIT BREAKER (A) $70.00

Crabtree C50 60 AMP Single Pole MCB Circuit Breaker C-50 60Amp 60A $58.13

(3) MULTI Union Single Pole Fuse Blocks 250v $75.00

Set of (10) Bussmann Fuse Blocks, single pole, 600v $75.00

New Qty 10 LEVITON 5224-21 DUAL SINGLE POLE SWITH 15A – IVORY Combo $69.99

Allen Bradley Bulletin 702 Size 4 200A Single Pole Contact Kit Z34117 NIB $84.99

20 LEVITON 20A SINGLE POLE TOGGLE SWITCHES CS120-2 $79.99

Single Pole Questions

How to Troubleshoot Single Pole and Three Pole Contactors

In the world of manufacturing, whether it be heavy industrial or light production, wherever you find an electric motor there’s always a contactor to drive and operate that motor. A contactor is simply an electrically controlled switch, also called a relay, used for switching a power circuit. It is designed so that when sufficient current flows through a coil built into the contactor, the magnetic field which is generated causes the contacts to be pulled in. The contacts, in turn operate as the switch. The contacts are appropriately sized by the designer of the particular circuit to handle current flow without overheating. Contactors are sold in a variety of sizes for specific applications. The design of the contacts themselves permit the contactor to be opened and closed repeatedly with minimal damage. This, of course can and will vary depending on the load current and failure can come rather quickly to an improperly sized contactor.

Contactors are designed and built in two popular configurations, single phase (or single pole) and three phase (three pole). This designation merely signifies the number of circuits that can be operated simultaneously. The coil is the means of operating the contacts. When it is energized with an appropriate voltage, it generates enough magnetic force to pull the contacts into a closed position, or close the power circuit. When the coil circuit is opened, spring pressure returns the contacts into the open position threrefore opening the power circuit. Coils are usually designed to accept a variety of popular voltages including 12, 24, 120, 240, and 480 volts AC as well as some DC control voltages like 12 and 24 volts. Other non-standard or less popular voltages are available as well.

The most common issue with a contactor, single or three phase would be a failed coil. This would cause the contactor to fail to energize when voltage is being applied to the coil. It can be tested in two ways, first in a power on situation, a check of the voltage at the coil terminals should give a definite answer as to whether the coil is energizing. On contactors with overload resets you’ll need to check the overload circuit of the contactor for failure or an open circuit if you do not read the appropriate voltage directly from the coil terminals. Of course you will need to verify the voltage with the label or nameplate on the coil also. Any doubt as to your finding, you can check for coil continuity also. Be sure to power down the circuit (or the machinery if necessary), select a low ohms setting on your multimeter and check the coil terminals. An open circuit (or high resistance) would signify an open coil whereas any moderate resistance would usually indicate that the coil is conducting electricity. A reading of 0 ohms would indicate a short circuit within the coil but this is rare because energizing a shorted coil usually amounts to excess heat, excess current, and an eventual opening of the coil internally.

The next most common failure is in the contacts themselves. They can fail in an open position, literally burned or melted open as a result of the contactor being improperly sized or the aftermath of a shorted load such as an overloaded motor. This can be tested by powering down the contactor circuit, both control and power circuit, and removing the power leads from the load side of the contactor. Energize the coil control circuit and check for the appropriate voltage on the load terminals. Proper voltage going into the contactor and lack of voltage going out of the contactor while it is energized or closed is a classic case of a failed contact. Another failure to the contacts would be a welded, or stuck contact which remains closed even when the contactor is de-energized. This situation can lead to further problems or damage downstream in the circuit possibly by energizing one or two legs of a three phase motor. With the control and power circuit de-energized this can be checked with an ohmmeter set on any range. A low ohm or 0 ohm reading would indicate a closed contact when in fact it should be open.

Additional contactor problems include mechanical failure such as in the return springs or the frame of the contactor and most of the time a visual inspection is enough to find a problem such as this. These failures typically occur after excessive heating or after the operating or service life of the contactor has been exceeded. Overall, the contactor troubleshooting is not complex, yet an overlooked failure within one of these critical components can sometimes confuse even a seasoned electrician or maintenance technician.

About the Author

Chet is an longtime associate of the Obsolete Industrial Parts, an informational site dedicated to locating obsolete industrial parts including obsolete contactors, servo motors, plc’s, limit switches, and a host of other parts. Their official website obsoleteindustrial.com is owned and operated by Val Marketing of Carbondale, Pennsylvania.

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