WEG
WEG DWE-3 Electronic Motor Protection Relay Class 20 High Inertia
Model: DWE-3-S3-MT-CLS20
4-hour response · Pricing in SAR · Delivery across all KSA regions
WEG DWE-3 Electronic Motor Protection Relay Class 20 High Inertia
The WEG DWE-3-S3-MT-CLS20 is the Class 20 trip class variant of the DWE-3 electronic motor protection relay, designed for three-phase induction motors driving high-inertia loads that require extended starting times before reaching rated speed. In Saudi industrial applications, high-inertia loads include large centrifugal fans (cooling tower fans, induced draft fans in furnaces and boilers), ball mill drives in cement plants at Yanbu and Jubail, large centrifugal pumps with significant flywheel effect, and conveyor systems with high belt mass.
Class 20 Trip Characteristic
The IEC 60947-4-1 Class 20 trip characteristic allows the motor starter to tolerate up to 7.2× FLC starting current for a longer period than Class 10 (20 seconds at 7.2× FLC vs. 10 seconds), enabling high-inertia motors to accelerate fully before the thermal element trips. Without Class 20 protection, a Class 10 relay would trip during the starting period of high-inertia loads, causing nuisance trip complaints and requiring manual intervention in Saudi industrial control rooms. The DWE-3-S3-MT-CLS20 eliminates these nuisance trips while maintaining full overload protection during running.
Saudi Industrial High-Inertia Motor Applications
Saudi Aramco's large induced draft fans in crude oil heaters at refineries typically have moment of inertia values (GD² values) requiring 15–25 second starting times. SABIC's large stirrer and agitator motors in polymer production require Class 20 or Class 30 protection to accommodate soft starting behaviour. Cement industry motors at Saudi Yanbu Cement, City Cement, and SAFCO's large granulation fans all require extended starting time protection available with the DWE-3-S3-MT-CLS20. Razz Middle East provides motor starting time calculations and relay class selection guidance as part of the DWE-3 technical support package.
Technical Specifications
Full specifications for the DWE-3-S3-MT-CLS20
- Motor Range
- 11 kW to 630+ kW
- Trip Class
- Class 20 (IEC 60947-4-1)
- Starting Tolerance
- 7.2× FLC for 20 seconds
- Phase Unbalance
- adjustable threshold
- Communication
- Modbus RTU RS-485
- Thermistor Input
- PTC
- Thermal Memory
- yes
- Standard
- IEC 60947-4-1
- Supply Voltage
- 24 V DC or 110–240 V AC
Key Features & Benefits
- IEC Class 20 trip characteristic for high-inertia loads
- 7.2× FLC tolerance for 20 seconds starting
- Eliminates nuisance trips on large fan motors
- Phase unbalance and phase loss detection
- Modbus RTU RS-485 communication
- Thermal memory restart inhibit
Industrial Applications in Saudi Arabia
- Large cooling tower fan motor starters
- Induced draft fan motors in Aramco heaters
- Ball mill drive motor protection
- Centrifugal pump high-inertia starters
- SABIC agitator and stirrer motor protection
- Cement plant large fan motor starters
Industrial Supplier in Saudi Arabia
Get a Quote for the WEG DWE-3 Electronic Motor Protection Relay Class 20 High Inertia
We respond within 4 business hours. Send model DWE-3-S3-MT-CLS20 for competitive pricing in SAR with delivery across Saudi Arabia and the GCC.
Frequently Asked Questions — DWE-3-S3-MT-CLS20
Common questions from buyers in Saudi Arabia and the GCC
What is the WEG DWE-3 Electronic Motor Protection Relay Class 20 High Inertia (DWE-3-S3-MT-CLS20) and what is it used for?
The WEG DWE-3-S3-MT-CLS20 is the Class 20 trip class variant of the DWE-3 electronic motor protection relay, designed for three-phase induction motors driving high-inertia loads that require extended starting times before reaching rated speed. In Saudi industrial applications, high-inertia loads include large centrifugal fans (cooling tower fans, induced draft fans in furnaces and boilers), ball mill drives in cement plants at Yanbu and Jubail, large centrifugal pumps with significant flywheel effect, and conveyor systems with high belt mass.
Where can I buy the WEG DWE-3-S3-MT-CLS20 in Saudi Arabia?
Razz Middle East supplies genuine WEG products including the WEG DWE-3 Electronic Motor Protection Relay Class 20 High Inertia (DWE-3-S3-MT-CLS20) across all regions of Saudi Arabia — Riyadh, Jeddah, Dammam, Al Khobar, Jubail, Yanbu, Mecca, and Medina. We maintain local stock on fast-moving items and can source specialist configurations. Request a quote on this page for same-day pricing.
How do I get the best price for the DWE-3-S3-MT-CLS20 in KSA?
Click "Request Free Quote" on this page or message us the model number DWE-3-S3-MT-CLS20 on WhatsApp. Our technical sales team responds within 4 business hours with a competitive price in SAR, confirmed stock availability, and delivery lead time — with no hidden charges or handling fees.
Is Razz Middle East an authorized WEG supplier in Saudi Arabia?
Razz Middle East is a specialist industrial equipment supplier in Saudi Arabia focused on WEG and other leading global brands. We supply 100% genuine OEM products backed by full manufacturer warranty, serving the oil & gas, petrochemical, power generation, water, construction, and manufacturing sectors across the Kingdom.
What is the delivery lead time for the WEG DWE-3 Electronic Motor Protection Relay Class 20 High Inertia in Saudi Arabia?
In-stock items typically ship within 24-48 hours to Riyadh, Dammam, Jeddah, and the Eastern Province. Project orders and non-standard configurations generally take 2-6 weeks. Contact us with the exact model number DWE-3-S3-MT-CLS20 for a precise availability confirmation and delivery date.
Can the DWE-3-S3-MT-CLS20 be supplied for ARAMCO, SABIC, or NEOM projects in KSA?
Yes. Razz Middle East has experience supplying WEG equipment to major industrial projects and EPC contractors across Saudi Arabia. We can provide full technical documentation, Material Inspection Reports (MIR), and certificates of conformity to meet vendor approval requirements. Contact our project team to discuss your specific project requirements.
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