Overview
Carrier® Vector® 1950 ST and MT refrigeration units are transitioning from traditional magnetic contactors to new electronic contactors, designed to improve reliability and simplify system wiring.
The new electronic contactors reduce failure rates, remove the need for contactor relays and auxiliary wiring, and introduce polarity-sensitive wiring requirements.
Technicians servicing Vector® 1950 systems should be aware of these changes when diagnosing, installing or replacing contactors.
Key Enhancements
Key improvements introduced with the new electronic contactors include:
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Electronic contactors replace traditional magnetic contactors
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Improved reliability and reduced failure rates
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Contactor relays are no longer required
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Simplified system wiring
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Auxiliary wires previously used on magnetic contactors are no longer needed
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Polarity-sensitive wiring is required for correct installation
Units Affected by the New Contactors
The updated contactor design applies to Carrier® Vector® 1950 systems produced from the following serial numbers.
| Vector® 1950 Model | Serial Number From |
| Vector® 1950 | RC743049 |
| Vector® 1950 MT 2CP | RC723002 |
| Vector® 1950 MT 2CP City | RC724157 |
| Vector® 1950 MT 3CP | RC742091 |
| Vector® 1950 MT 3CP City | RC737156 |
⚠ Important
Units produced before these serial numbers still use magnetic contactors and require contactor command relays for proper operation.
Wiring Guidelines for the New Electronic Contactors
The new electronic contactors used in Carrier® Vector® 1950 units require correct wiring polarity.
Unlike the previous magnetic contactors, these electronic contactors are polarity-sensitive and must be installed according to the marked positive and ground connections.
Incorrect polarity may prevent the system from operating correctly or lead to system failure.
Contactor Polarity Reference
Polarity reference for the C30 electronic contactor and corresponding electrical diagram
Technicians should ensure that the contactor is wired according to the polarity markings shown on the contactor.
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Positive (+12V) must be connected to the terminal marked +
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Ground must be connected to the terminal marked –
Incorrect polarity may prevent the contactor from operating correctly.
Replacement Parts – Electronic Contactors
| Old Contactor Type | Old P/N | New Electronic Contactor P/N |
| Magnetic (No Auxiliary) | N/A | 10-00503-30 |
| Magnetic (Auxiliary Right) | 10-00433-00 | 10-00503-31 |
| Magnetic (Auxiliary Left) | 10-00433-06 | 10-00503-32 |
⚠ Caution
Older magnetic contactors 10-00433-00 and 10-00433-06 cannot be used in units produced after the serial number change.
Important Installation Note for Older Units
For pre-changeover units, if a new electronic contactor is installed, the following contactor command relays must not be removed, as they are required for correct system operation:
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PSCONR
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GENCONR
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CCONR
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HTCON1R
Updated Control Box and Electrical Diagram Part Numbers
| Vector® 1950 Model | New Control Box P/N | New Electrical Diagram P/N |
| Vector® 1950 | 91-60372-10 | 62-61693-01 |
| Vector® 1950 MT 2CP | 91-60372-20 | 62-61686-02 |
| Vector® 1950 MT 3CP | 91-60372-30 | 62-61686-02 |
| Vector® 1950 MT 2CP City | 91-60372-21 | 62-61697-02 |
| Vector® 1950 MT 3CP City | 91-60372-31 | 62-61697-02 |
The introduction of electronic contactors required updates to both the control box assemblies and electrical diagrams used in these systems.
In addition to the Vector® 1950 update, similar electronic contactor changes are also being introduced for certain Carrier® Vector® 1350 units.
Additional Update for Vector® 1350 Units
The bulletin also confirms that the same electronic contactor technology is being introduced in Vector® 1350 systems.
This includes:
| Vector® 1350 Model | Serial Number From | Model Year |
| Vector® 1350 AR3P | AC84007 | AC838029M |
| Vector® 1350 DPH | To Be Advised | To Be Advised |
These contactors are also polarity-sensitive and must be wired correctly.
Vector® 1350 Contactor Polarity
Polarity reference for electronic contactors used in Carrier® Vector® 1350 units
Replacement Parts for Vector® 1350
| Old Contactor P/N | New Electronic Contactor P/N | Application |
|---|---|---|
| 10-00433-06 | 10-00503-32 | Auxiliary on Left (PSCON1) |
| 10-00433-00 | 10-00503-31 | Auxiliary on Right (PSCON2 – AR3P Only) |
| 10-00433-06 | 10-00503-30 | No Auxiliary (SBMCON) |
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The PSCON2 contactor is only used on Vector® 1350 AR3P units.
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It is not present on Vector® 1350 DPH units.
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The SBMCON standby motor contactor no longer requires an auxiliary connection, as this function is now handled internally.
Download the Full Technical Bulletin
At the bottom of the article add the download link.
Download the full PDF Technical Bulletin
Carrier® Vector® 1950 ST & MT Electronic Contactor Update
Need Assistance?
If you require assistance identifying compatible electronic components or configuration settings for Carrier® Vector® refrigeration systems, the Myriad team can help.
Visit www.myriadparts.com or contact our technical team for support.