KRIWAN Industrie-Elektronik

Motor Protection Relay INT69

Name: Motor Protection Relay INT69
Brand: KRIWAN Industrie-Elektronik

The KRIWAN INT69 motor protection relay is the industry standard for protecting electrical machines from thermal overload.

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KRIWAN Industrie-Elektronik

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Used worldwide, it ensures reliable temperature monitoring by combining the INT69 trip device with PTC sensors. Depending on the model, the INT69 can monitor up to nine PTC sensors with different response temperatures. If the temperature exceeds a predefined limit, the relay triggers an immediate shutdown, preventing overheating and damage. Key benefits include diagnostic functions, storage of operating and fault data, and customizable software settings for specific applications. Its compact design allows easy integration into electrical devices and terminal boxes. With decades of proven performance, the KRIWAN INT69 is the trusted choice for global motor protection applications.

The KRIWAN INT69 motor protection relay is a benchmark in motor protection, preventing thermal overload and ensuring the longevity of electrical machines. As KRIWAN’s flagship product, the INT69 is trusted worldwide for precise, reliable temperature monitoring.

This protection system consists of the INT69 trip device and PTC sensors, providing early detection of critical temperatures in electric motors, compressors, and transformers. Depending on the version, the INT69 can connect up to nine PTC sensors (DIN 44081/44082), even with different nominal response temperatures. This enables multiple measurement points to be monitored with just one relay, ensuring comprehensive protection.

PTC sensors respond to temperature changes by increasing resistance. When the threshold is reached, the INT69 automatically shuts down the motor, preventing overheating and damage. This static temperature monitoring ensures protection under normal operating conditions.

For even greater safety, the INT69 features dynamic temperature monitoring: if a sudden rise in temperature is detected, the relay shuts down the motor immediately, even if the temperature is still below the standard response level. This prevents extreme temperature peaks that could cause damage.

Key benefits of the INT69

Advanced diagnostics – stores operational and fault data for troubleshooting and predictive maintenance
Multiple versions – suitable for various applications and motor types
Tamper-proof design – secure hardware and software for reliable protection
Customizable software – allows user-defined parameterization for specific system requirements (model-dependent)
Compact and easy to integrate – fits into electrical devices and motor terminal boxes

With decades of field-proven reliability, the INT69 is the gold standard in motor protection across industries. Whether for compressors, pumps, or industrial drives, the INT69 ensures maximum safety and efficiency.

System Specifications

Dimensions
68mm x 33mm x 50mm | 76.5mm x 35mm x 81.5mm (Depending on model)
Weight
approx. 200g
Supply voltage
AC 50/60Hz 115/120V – 230/240V ±10% 3VA | AC 50/60Hz 24V ±10% 3VA (Depending on model)

Permitted ambient temperature
-30…+70°C
Temperature measuring circuits
Type: 1-2 AMS sensors in series | 1-9 PTC sensors acc. to DIN 44081, DIN 44082 in series (Depending on model)
R25, total: <1.8kΩ
Rtrip
4.5kΩ±20%
Rreset
2.75kΩ±20%
Max. llegnt connection line: 30m
Short circuit monitoring system PTC
typically <30Ω (Depending on model)
Phase monitoring
(Depending on model) Phase sequence: active about 1s after motor start for about 5s
Phase failure
active about 1s after the motor start until the motor stop
Inactive
after motor stop for approx. 20s
Reset delay
(Depending on model) Motor temperature static: 1min ±12s | 5min ±1min (Depending on model)
Motor temperature dynamic
5min ±1min (Depending on model)
Discharge gas temperature
10min ±2min
Switching frequency overstepping
5min ±1min
Incorrect phase sequence
Locked (Depending on model)
Phase failure
Locked (Depending on model)
Reset of reset delay
Main reset >5 sec only possible if there is no error current (Depending on model)
Switching frequency overstepping
3 switch-offs in 30s (Depending on model)
Relay
Contact: AC 240V 2.5 A C300 – at least AC/DC 24V 20 mA | AC 240V 2.5 A C300 – at least AC/DC 100mV 0.5mA (Depending on model)
Mechanical service life
approx. 1 million switching cycles
Protection class acc. to EN 60529
IP20 | IP00
Connection type
screw type terminal | Flat plug sleeves (Depending on model)
Housing material
PA glass-fibre-reinforced
Mounting
Screw mounted
Approval: UL