I was recently asked by my manager to help identify this component for a board repair. At the moment, I only have a photo of the part, so I don’t yet have access to the board to take measurements or check it with a multimeter.

The component is from a heater controller board — specifically a Watlow PM8C1EC-AAAAAAA — and the part itself is labeled “DTR.”

Any insight on what this component might be would be greatly appreciated. Thanks!

 

looks like fuse but it could be something else too. once you get the board take good picture of front and back.

https://www.littelfuse.com/products...ace-mount-fuses/nano-2-fuses/415/0415001-drsp
https://www.digikey.ca/en/products/..._a8LumW3eUjgtN_9Pcn5J5Knl2naHn3UaAktHEALw_wcB
https://www.rapidonline.com/schurter-3403-0173-11-umt-smd-fuse-3x10-1mm-time-delay-5a-26-3016

 

The MOSFET immediately to the right of the "DTR" part doesn't look too healthy, though the picture is very blurred. There appears to be a small hole/pit in the centre and some discolouration on the surface which could suggest an overheated or blown part.

 

The 'DTR' part might be a current shunt rather than a fuse...

 

If you're talking about the orange part, Google says:

The selected component is a [TE Connectivity Schrack RTD34024](https://www.te.com/en/product-3-1419108-8.html) General Purpose Power PCB Relay. [1, 2]
## Technical Specifications

* Coil Voltage: 24 VDC
* Contact Arrangement: 1 Form A (SPST-NO) (Single Pole Single Throw, Normally Open)
* Current Rating: 16 A switching current
* Rated Voltage: 250 VAC switching capability
* Coil Resistance: 1.44 kΩ ($\pm10\%$)
* Coil Power Consumption: 400 mW nominal
* Environmental Protection: RTIII (Wash-tight enclosure category)
* Mounting Style: Through-Hole (THT) with 5mm pinning layout [1, 3, 4, 5, 6, 7]

## Physical Dimensions

* Length: 29.0 mm
* Width: 12.7 mm
* Height: 15.7 mm [1]

## Procurement & Industry Use
This series is widely integrated into industrial controls, timers, automation equipment, and boiler controllers. Standard replacement parts can be sourced globally from major electrical component distributors like [DigiKey](https://www.digikey.com/en/products/detail/te-connectivity-potter-brumfield-relays/RTD34024/1128669), [Mouser Electronics](https://www.mouser.com/ProductDetail/TE-Connectivity-PB/RTD34024?qs=h4sDRd%2FXtth8Yhy4pibwmw%3D%3D), and [Farnell](https://uk.farnell.com/schrack-te-connectivity/rtd34024/power-relay-spst-no-16a-250v-th/dp/2748038). [2, 8, 9, 10, 11]

[RTD34024 TE Connectivity | TE Connectivity PCB Power Relay ...](https://sa.rsdelivers.com/product/te-connectivity/rtd34024/te-connectivity-pcb-mount-power-relay-24v-dc-coil/6803940), RS Components
[RTE24024 TE CONNECTIVITY - SCHRACK, General Purpose Relay ...](https://www.newark.com/schrack-te-connectivity/rte24024/relay-dpdt-250vac-8a/dp/17M9933), Newark Electronics
[RT314F05 TE Connectivity | TE Connectivity PCB Power Relay ...](https://sa.rsdelivers.com/product/te-connectivity/rt314f05/te-connectivity-pcb-power-relay-5v-dc-coil-16a/1614496), RS Components
[RT33K024 Power Relay 24V 16A TE Connectivity :: SM Elektronik](https://sm-elektronik.eu/index.php?p5027,rt33k024-power-relay-24v-16a-te-connectivity), SM Elektronik
[Schrack RT314524 Relay (ben1) | eBay](https://www.ebay.com/itm/275757465022), eBay
[1 PC) RTE24005 TE RELAY GEN PURPOSE DPDT 8A 5V | eBay](https://www.ebay.com/itm/225561381391), eBay
[RT424F24 TE CONNECTIVITY - SCHRACK, Power Relay, DPDT, 24 VDC ...](https://il.farnell.com/schrack-te-connectivity/rt424f24/relay-dpdt-250vac-8a/dp/1175086), Farnell Israel
[260PCS TYCO RT424615 Power Relay 8A 250VAC 8Pins | eBay](https://www.ebay.com/itm/115467899634), eBay
[SCHRACK RT424024 24VDC](https://wellgainelectronics.com/pcb-relays/28438-schrack-rt424024-24vdc.html), Well Gain Electronics
[The Difference Between Electromechanical and Solid State ...](https://control.com/technical-articles/differences-between-electromechanical-and-solid-state-relays/), Control.com
[5 PCS RT314024 24VDC 16A 24V Relay](https://cityoflakewood.us/listing/5-pcs-rt314024-24vdc-16a-24v-relay?srsltid=212610408), City of Lakewood
[RT314006 | TE Connectivity PCB Power Relay, 6V dc Coil, 16A ...](https://twen.rs-online.com/web/p/power-relays/6803735), RS

If you are diagnosing or replacing this component, tell me:

* What symptoms or malfunctions is the circuit board showing?
* Have you tested the coil with a multimeter to verify its internal resistance?

I can provide diagnostic steps to confirm if the relay has failed.

[1] [https://www.te.com](https://www.te.com/en/product-3-1419108-8.html)
[2] [https://www.mouser.com](https://www.mouser.com/ProductDetail/TE-Connectivity-PB/RTD34024?qs=h4sDRd%2FXtth8Yhy4pibwmw%3D%3D)
[3] [https://sg.element14.com](https://sg.element14.com/schrack-te-connectivity/rtd34024/power-relay-spst-no-16a-250v-th/dp/2748038)
[4] [https://docs.rs-online.com](https://docs.rs-online.com/2e70/A700000007238306.pdf)
[5] [https://www.te.com](https://www.te.com/en/product-1-1393243-0.html)
[6] [https://in.rsdelivers.com](https://in.rsdelivers.com/product/te-connectivity/rtd34024/te-connectivity-pcb-power-relay-24v-dc-coil-16a/6803940P)
[7] [https://www.farnell.com](https://www.farnell.com/datasheets/1869190.pdf)
[8] [https://www.mouser.com](https://www.mouser.com/ProductDetail/TE-Connectivity-Schrack/RTE24024?qs=no2tHrF3Eb29p1pIXPhMgA%3D%3D)
[9] [https://my.mouser.com](https://my.mouser.com/ProductDetail/TE-Connectivity-PB/RTD34024?qs=h4sDRd%2FXtth8Yhy4pibwmw%3D%3D)
[10] [https://www.digikey.com](https://www.digikey.com/en/products/detail/te-connectivity-potter-brumfield-relays/RTD34024/1128669)
[11] [https://uk.farnell.com](https://uk.farnell.com/schrack-te-connectivity/rtd34024/power-relay-spst-no-16a-250v-th/dp/2748038)