MTR1 R125 Thermal Cutoff - Equivalent & Substitute Parts

Part Overview

The MTR1 R125 is a Thermal Cutoff (TCO) device rated for 250VAC at 3A with a functioning temperature of 130°C (266°F) in radial package configuration. This component is classified as a fuse-type thermal protection device with a holding temperature of 100°C (212°F) and maximum temperature limit of 180°C (356°F).

The MTR1 R125 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure continued availability for applications requiring thermal cutoff protection with these electrical and mechanical specifications.

Substiute Parts

MTR1 R125

CanthermIn Stock: 1073MTR1 R125 Datasheet

Current PartRFQ

MTS1 S125

CanthermIn Stock: 938MTS1 S125 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MTR1 R125 are identified based on electrical and mechanical compatibility within the thermal cutoff component category. The primary substitution criteria are:

Electrical Parameters (Must Match):

• Voltage Rating - AC: 250VAC
• Rated Functioning Temperature: 130°C (266°F)
• Holding Temperature: 100°C (212°F)
• Maximum Temperature Limit: 180°C (356°F)
• Package / Case: Radial

Allowable Variation:

• Current Rating: The substitute part MTS1 S125 operates at 5A, which represents a higher current capacity than the original 3A specification. This part is suitable for applications where the thermal protection threshold remains at 130°C but higher current handling is acceptable or required.

The MTS1 S125 maintains identical thermal characteristics and voltage ratings while providing increased current capacity, making it a valid substitute for circuits where the 3A limitation is not a design constraint.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: The MTS1 S125 is the identified substitute for the obsolete MTR1 R125. Both components share identical thermal protection characteristics (130°C functioning temperature, 100°C holding temperature) and voltage ratings (250VAC). The radial package configuration is identical, ensuring mechanical compatibility in existing PCB layouts.

Product Status Consideration: The MTR1 R125 is obsolete, while the MTS1 S125 is active and currently in production. Selection of the MTS1 S125 ensures long-term component availability and supply chain continuity.

Compliance Status: Both parts maintain REACH Unaffected status and EAR99 ECCN classification, indicating equivalent regulatory compliance for export and use applications.

Current Rating Difference: The MTS1 S125 operates at 5A compared to the MTR1 R125 at 3A. This higher current capacity does not affect thermal protection performance. Selection should be based on circuit current requirements: use MTS1 S125 if circuit current exceeds 3A or if higher current capacity is acceptable; use MTR1 R125 only if 3A current limitation is a design requirement and availability can be confirmed.

Frequently Asked Questions (FAQ)

Q: Can the MTS1 S125 be used as a direct replacement for the MTR1 R125?

A: Yes. Both components have identical voltage ratings (250VAC), thermal functioning temperature (130°C), holding temperature (100°C), and radial package configuration. The MTS1 S125 has a higher current rating (5A vs. 3A), which does not prevent substitution if circuit current requirements are within the 5A limit.

Q: What is the difference between the 3A and 5A current ratings?

A: The current rating indicates the maximum continuous current the component can carry before thermal activation. The MTR1 R125 is rated for 3A, while the MTS1 S125 is rated for 5A. Both activate at the same temperature (130°C). Selection depends on circuit current: if circuit current is below 3A, either part is suitable; if circuit current is between 3A and 5A, only the MTS1 S125 is appropriate.

Q: Are the radial packages identical between these parts?

A: Yes. Both the MTR1 R125 and MTS1 S125 use radial package configuration, ensuring identical PCB footprint and mounting compatibility.

Q: Why is the MTR1 R125 listed as obsolete?

A: The MTR1 R125 has been discontinued by the manufacturer. The MTS1 S125 represents the active equivalent in the Cantherm thermal cutoff product line.

Q: Do these parts have the same regulatory compliance?

A: Yes. Both parts are REACH Unaffected and classified as EAR99 for export control purposes, indicating equivalent compliance status.

Q: What is the holding temperature, and how does it differ from the functioning temperature?

A: The holding temperature (100°C) is the maximum temperature at which the thermal cutoff remains in its normal conducting state. The functioning temperature (130°C) is the temperature at which the device activates and interrupts the circuit. Both parts share identical holding and functioning temperatures.