TE Connectivity 3-1393303-9 General Purpose Relay SPST 40A 12V Equivalent & Substitute Parts

Part Overview

The TE Connectivity Potter & Brumfield Relays 3-1393303-9 is a general purpose, non-latching SPST relay rated for 40A at 12VDC. This component operates as a single-pole, single-throw normally open (1 Form A) contact configuration with socketable mounting and quick-connect termination. The relay is designed for applications requiring reliable switching of moderate to high current loads in industrial and commercial environments.

The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts become necessary when primary inventory is unavailable, when alternative sourcing is required for supply chain optimization, or when equivalent performance specifications are acceptable for system requirements.

Substiute Parts

3-1393303-9

TE Connectivity Potter & Brumfield RelaysIn Stock: 8793-1393303-9 Datasheet

Current PartRFQ

7-1393302-5

TE Connectivity AMP ConnectorsIn Stock: 14627-1393302-5 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TE Connectivity 3-1393303-9 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part 7-1393302-5 qualifies as a parametric equivalent based on the following criteria:

Electrical Equivalence: All coil specifications match identically: 12VDC coil voltage, 133.3 mA coil current, 1.6W coil power, and 90 Ohms coil resistance. Contact performance parameters are identical: 40A current rating, SPST-NO (1 Form A) configuration, 7 ms operate time, and 2 ms release time. Voltage thresholds for operation and release are identical: 7.2 VDC must-operate and 1.6 VDC must-release.

Mechanical Equivalence: Both parts feature socketable mounting with identical termination style: Plug In, Quick Connect - 0.250" (6.3mm). Operating temperature range is identical: -40°C to 125°C. Contact material is identical: Silver Alloy.

Functional Equivalence: Both parts are non-latching relays with identical switching voltage (14VDC nominal) and identical contact form (SPST-NO, 1 Form A).

Compliance Equivalence: Both parts maintain Active product status and RoHS compliance. Both carry MSL 1 (Unlimited) moisture sensitivity rating.

Parameter Comparison

Engineering Selection Recommendations

Both the TE Connectivity 3-1393303-9 and 7-1393302-5 are suitable for direct substitution in applications requiring a 12VDC, 40A SPST general purpose relay with socketable mounting and quick-connect termination.

Primary Part Selection (3-1393303-9): Select this part when available from primary inventory. It carries RoHS3 compliance certification and maintains the Potter & Brumfield Relays product line designation.

Substitute Part Selection (7-1393302-5): Select this part when the primary part is unavailable or when supply chain sourcing requires alternative procurement. This part carries RoHS compliance certification and is manufactured by TE Connectivity AMP Connectors division. Current inventory availability is 1419 pieces, compared to 776 pieces for the primary part.

Both parts are Active products with identical electrical performance, mechanical compatibility, and environmental operating specifications. Selection between these parts is based on availability and procurement requirements rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can the 7-1393302-5 be used as a direct replacement for the 3-1393303-9 in existing circuit designs?

A: Yes. The 7-1393302-5 is a parametric equivalent with identical coil voltage (12VDC), coil current (133.3 mA), contact rating (40A), contact form (SPST-NO), switching characteristics (7 ms operate, 2 ms release), and mechanical mounting (socketable with 0.250" quick-connect termination). No circuit modifications are required.

Q: Are there any differences in RoHS compliance between these parts?

A: Both parts are RoHS compliant. The primary part carries RoHS3 certification, while the substitute carries RoHS certification. Both meet regulatory requirements for hazardous substance restrictions.

Q: Do these relays have identical operating temperature ranges?

A: Yes. Both parts operate across the identical temperature range of -40°C to 125°C, ensuring equivalent thermal performance in all environmental conditions.

Q: What is the significance of the socketable mounting type?

A: Socketable mounting indicates both relays are designed for installation into relay sockets, allowing for tool-free insertion and removal. This feature is identical between both parts, ensuring mechanical interchangeability.

Q: Are the contact materials the same?

A: Yes. Both relays use Silver Alloy contact material, providing identical electrical conductivity and switching performance characteristics.

Q: What is the coil resistance specification used for?

A: Coil resistance (90 Ohms for both parts) determines the current draw when the coil is energized at the specified voltage (12VDC). This value is used in circuit design to calculate power consumption and ensure adequate power supply capacity. Both parts have identical resistance, confirming electrical equivalence.

Q: Can these relays be used interchangeably in high-current switching applications?

A: Yes. Both relays are rated for 40A continuous current switching with identical switching voltage (14VDC nominal) and contact material (Silver Alloy). They are suitable for identical high-current applications.

Q: What does the SPST-NO (1 Form A) contact configuration mean?

A: SPST-NO (Single-Pole, Single-Throw, Normally Open) with 1 Form A indicates the relay has one contact pair that is open when the coil is de-energized and closes when the coil is energized. This configuration is identical in both parts.