Honeywell 13AT3 Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The Honeywell 13AT3 is a DPDT (Double Pole Double Throw) toggle switch rated for 5A at 250V AC and 30V DC, designed for panel mount applications with a standard round actuator. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing maintenance, repair, and new design applications where the original part is no longer available from primary sources.

Substiute Parts

13AT3

Honeywell Sensing and Productivity SolutionsIn Stock: 103513AT3 Datasheet

Current PartRFQ

112TW1-5

Honeywell Sensing and Productivity SolutionsIn Stock: 782112TW1-5 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Honeywell 13AT3 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Circuit configuration: DPDT
• Switch function: On-Off-Mom
• Current rating: 5A (AC/DC)
• Mounting type: Panel Mount
• Actuator type: Standard Round
• Panel cutout diameter: 12.40mm Circular
• Bushing thread: 15/32-32
• Termination compatibility: Electrical interface capability

Allowable Variation Parameters:

• Voltage rating (AC): Substitute must meet or exceed 250V AC requirement
• Voltage rating (DC): Substitute must meet or exceed 30V DC requirement
• Actuator length: Minor variations acceptable within mechanical envelope constraints
• Product status: Active parts preferred for long-term availability
• Termination style: May differ if electrical connection is functionally equivalent

The Honeywell 112TW1-5 qualifies as a substitute based on matching circuit, function, current rating, mounting configuration, and panel interface specifications. Voltage ratings differ (125V AC / 28V DC versus 250V AC / 30V DC), requiring application-level verification that the substitute's voltage ratings are sufficient for the intended circuit.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using Honeywell 13AT3:

The Honeywell 112TW1-5 is an active substitute part from the same manufacturer. Selection should be based on the following criteria:

1. Voltage Requirement Verification: The 112TW1-5 is rated for 125V AC and 28V DC, compared to the 13AT3's 250V AC and 30V DC ratings. Confirm that the application circuit operates at or below 125V AC and 28V DC. If higher voltages are required, the 112TW1-5 is not suitable.

2. Termination Compatibility: The 13AT3 uses Solder Lug termination, while the 112TW1-5 uses IWTS (Insulated Wire Terminal Style). PCB or harness modifications are required to accommodate the different termination interface.

3. Product Status and Availability: The 112TW1-5 is classified as Active, ensuring continued availability and supply chain stability compared to the obsolete 13AT3.

4. Environmental Performance: The 112TW1-5 includes Environment Sealed ingress protection and a defined operating temperature range (-65°C ~ 71°C), providing enhanced environmental performance specifications.

5. Compliance: Both parts are RoHS Compliant and carry MSL Rating 1, meeting regulatory and moisture sensitivity requirements.

Selection Decision: Use the 112TW1-5 as a substitute only when application voltage requirements do not exceed 125V AC / 28V DC and termination adaptation is feasible.

Frequently Asked Questions (FAQ)

Q: Can the Honeywell 112TW1-5 directly replace the 13AT3 without modifications?

A: Direct replacement is not possible due to two key differences: (1) Voltage ratings are lower on the 112TW1-5 (125V AC / 28V DC versus 250V AC / 30V DC), and (2) Termination styles differ (IWTS versus Solder Lug). Electrical circuit voltage must be verified as compatible, and termination interface must be adapted.

Q: What does DPDT mean, and why is it important for substitution?

A: DPDT (Double Pole Double Throw) describes the switch's electrical configuration: two independent circuits, each capable of switching between two positions. This is a mandatory matching parameter for substitution. Both the 13AT3 and 112TW1-5 are DPDT switches.

Q: What is the difference between Solder Lug and IWTS termination?

A: Solder Lug termination uses flat metal tabs soldered directly to PCB pads or wire connections. IWTS (Insulated Wire Terminal Style) uses insulated crimp terminals for wire connections. These require different connection methods and cannot be interchanged without adapter hardware or harness redesign.

Q: Why is the 13AT3 listed as obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by Honeywell. Existing inventory may be available from authorized distributors, but long-term supply cannot be guaranteed. The 112TW1-5 is an active alternative for new designs and ongoing applications.

Q: Are both parts RoHS compliant?

A: Yes, both the 13AT3 and 112TW1-5 are RoHS Compliant, meeting environmental and regulatory requirements for hazardous substance restrictions.

Q: What is MSL Rating 1, and why does it matter?

A: MSL (Moisture Sensitivity Level) Rating 1 indicates unlimited shelf life with no special moisture control requirements during storage or handling. Both parts carry this rating, simplifying inventory management.

Q: Can I use the 112TW1-5 in a 250V AC circuit?

A: No. The 112TW1-5 is rated for 125V AC maximum. Using it in a 250V AC circuit exceeds its voltage rating and creates a safety and reliability hazard. Application voltage must not exceed the substitute part's rating.

Q: What is the significance of the 12.40mm panel cutout diameter?

A: This dimension specifies the hole size required in the control panel for mounting. Both the 13AT3 and 112TW1-5 use the same 12.40mm circular cutout, ensuring mechanical compatibility with existing panel designs.

Q: How do the actuator lengths compare?

A: The 13AT3 has a 17.53mm actuator length, while the 112TW1-5 is 17.27mm. The 0.26mm difference is within typical mechanical tolerances and does not affect functional compatibility or panel mounting.

Q: What does "On-Off-Mom" switch function mean?

A: This indicates the switch has three positions: On (maintained), Off (maintained), and Mom (momentary). Both the 13AT3 and 112TW1-5 provide this functionality.