PHOENIX CONTACT EMD-SL-PTC 2866093

Phoenix Contact EMD-SL-PTC Motor Temperature Monitoring Relay

Description

This is the EMD-SL-PTC thermistor monitoring relay from Phoenix Contact, a crucial component for motor protection. It accurately monitors the temperature of motor windings using PTC sensors. This unit comes complete with the EMD-SL-PS-230AC plug-in power module, making it ready for integration into 230V AC control systems. Designed for DIN rail mounting, it offers a reliable and compact solution to prevent motor damage due to overheating.

Specifications

• Manufacturer: Phoenix Contact
• Type: EMD-SL-PTC
• Order Number: 28 66 093
• Power Module: EMD-SL-PS-230AC (Order No. 28 66 129)
• Supply Voltage: 230V AC, 50/60Hz
• Input: For up to 6 PTC sensors in series (Roff > 3.6k Ohm)
• Output: 1 changeover contact
• Switching Capacity: 5A / 250V
• Operating Temperature: -25 deg C to +55 deg C

Label Info

• Serial Number: 2001634430
• UL Listed: NO.CONTEQ 65GN

Application

Ideal for use in industrial automation, manufacturing, and process control to monitor the temperature of electric motors, transformers, and other equipment susceptible to overheating. It plays a vital role in preventative maintenance and machine safety protocols.

Country of Origin

Made in Germany.

CO2 Impact

By purchasing this pre-owned component, you are helping to avoid the emission of approximately 4.0 kg of CO2, which is associated with the production of a new unit. This is comparable to the CO2 savings from driving a car for 20 km.

Availability

This product is an obsolete item but is available from our stock. It is a reliable spare part for existing installations. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the difference between the EMD-SL-PTC and its successor, the EMD-FL-PTC-280?

The EMD-FL-PTC-280 is a more modern design, featuring a narrower housing (only 17.5 mm wide), enhanced diagnostics via LEDs, and a wider temperature range. However, the core function of monitoring PTC thermistors is identical.

Can I use a different power supply module with the EMD-SL-PTC base unit?

Yes, the EMD-SL-PTC base is compatible with various plug-in power modules from the Phoenix Contact EMD-SL-PS… series. This allows you to adapt the unit for different supply voltages, such as 24V DC or 120V AC, simply by swapping the module.

How do I correctly connect PTC thermistors to this relay and what does ‘Max. 6 PTCs’ mean?

The PTC sensors must be connected in series across terminals T1 and T2. The ‘Max. 6 PTCs’ specification means that the total cold resistance of all series-connected thermistors should not exceed the standard limit, which is typically under 1.5 kOhm.

Last Update: Friday, March 13, 2026

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