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Minilec Temperature Protection Relay PTC

Minilec Temperature Protection Relay PTC Specification

Contact Resistance
<50 m

Coil Voltage
N/A (uses supply voltage for operation)

Coil Power
N/A (electronic relay, no conventional coil)

Contact Material
Silver alloy

Power Consumption
Approx. 2 VA max

Mechanical Life
>10 million operations

Ambient Temperature
-5C to +55C

Working Temperature
-25C to +60C

Contact Form
SPDT

Protect Feature
Over-temperature trip, Manual & Auto reset

Dielectiric Strength
2kV AC, 1 minute between contacts & coil

Product Type
Temperature Protection Relay (PTC)

Insulation Resistance
>= 100 M at 500V DC

Theory
Electronic Relay based on PTC thermistor input

Usage
Temperature monitoring and protection of motors and transformers

Contact Load
5A @ 250V AC (resistive load)

Operate Time
<100ms

Terminal Type
Screw type

Rated Voltage
230V AC / 110V AC

Supply Terminal
L & N (Line and Neutral)

Size
Standard Compact

Color
Grey / Blue

Dimension (L*W*H)
Approx. 85 x 22.5 x 58 mm

Weight
Approx. 120 g

Reset Facility
Manual and Automatic

Input Sensor Type
PTC Thermistor Sensor

Output Contacts
1 Changeover (C/O); SPDT

Control Voltage
230V AC / 110V AC selectable

Frequency
50-60 Hz

Mounting Type
DIN Rail Mounting

Indication
LED for Supply ON, Trip

Enclosure Material
Flame Retardant Polycarbonate

Response Time
Fast response (<100ms)

About Minilec Temperature Protection Relay PTC

Minilec Temperature Protection Relay

OVERVIEW :-

PTC Thermistors are semi conductor sensors. These have typical characteristics that change their resistance instantly at a specified pre-defined response temperature
(NRT). As soon as the surrounding temperature of PTC reaches its NRT value the body resistance of PTC Thermistor rises sharply from 200 / 250 Ohms to more than 5000 Ohms.The PTC Thermistors are embedded in the overhang location of the motor windings.

The NRT value of PTC is selected according to the Insulation Class of the copper windings of motor or transformers.

TECHNICAL SPECIFICATION:-

Selection Chart for NRT of PTC Thermistors.
NRT °C	Class of Ins.	Cable Colour Code
70	-	White - Brown
80	-	White - White
90	-	Green - Green
100	A	Red - Red
110	-	Brown - Brown
120	E	Grey - Grey
130	B	Blue - Blue
140	-	White - Blue
150	F	Black - Black
160	-	Blue - Red
170	H	White - Green
180	C	White - Red
190	-	Orange - Black

Minilec offers CBCT for our Earth fault relay & Earth Leakage Relay.

Ordering Information:

Primary & Secondary Current.

:
:
:

Inner Diameter.
Outer Diameter.
Minilec Relay Model Name.

Note:

Wherever not specified Contact Rating : 5A @ 230 V AC (resistive)

Accurate Temperature Monitoring

Equipped with a precise PTC thermistor sensor, the Minilec Temperature Protection Relay quickly detects any excess temperature in motors and transformers. Its fast response time, under 100 milliseconds, minimizes potential damage due to overheating, ensuring optimal equipment health and longevity.

Flexible Installation and Control

Designed for straightforward DIN rail mounting, this relay accommodates both 230V AC or 110V AC inputs. Users can choose between manual and automatic reset functions, allowing adaptation to various protection requirements. LED indicators provide clear, immediate status visibility for supply, trip, and operation.

Durable and Safe Design

Manufactured with a flame-retardant polycarbonate enclosure and featuring silver alloy contacts, the relay supports heavy-duty operations. It boasts mechanical durability exceeding 10 million cycles. With strong insulation and dielectric strength, it guarantees safe performance even in demanding environments.

FAQs of Minilec Temperature Protection Relay PTC:

Q: How does the PTC Temperature Protection Relay operate in motor and transformer applications?

A: The relay uses a PTC thermistor sensor to continuously monitor temperature. When the sensor detects an over-temperature condition, the relay trips rapidly (within 100ms), disconnecting power to protect the motor or transformer from potential damage.

Q: What is the process for resetting the relay after a trip event?

A: The relay offers both manual and automatic reset facilities. After a trip, users can manually reset the relay via a panel button or allow it to automatically reset if the temperature falls back within safe limits.

Q: Where can this protection relay be installed?

A: Its DIN rail mounting system enables easy integration into standard electrical control panels commonly found in industrial settings, particularly for motor and transformer temperature protection across various applications.

Q: What are the benefits of using a PTC thermistor sensor in this relay?

A: PTC thermistor sensors provide accurate and rapid response to temperature changes. Their use in this relay ensures that overheating conditions are detected early, minimizing equipment damage and improving operational safety.

Q: When should the control voltage selection be made during installation?

A: Control voltage selection (230V AC or 110V AC) should be determined at the time of wiring. Choose according to the supply voltage available in your installation, guided by the relays input terminals for line and neutral.

Q: What type of output contact is provided and what is its load capacity?

A: The relay features a single SPDT changeover contact, capable of handling up to 5A at 250V AC (resistive load), suitable for switching control circuits or directly isolating the protected equipment.

Q: How does the LED indication help in relay usage?

A: LED indicators on the relay provide instant visual feedback for supply ON and trip conditions. This assists operators in monitoring system status and quickly addressing any fault events, enhancing overall plant reliability.

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