Overcurrent Secondary Protection Relays Selection Guide: Technical Criteria & Application Standards
Overcurrent Secondary Protection Relays selection guide: technical parameters, mounting and compliance standards, and Siemens, Entes comparison.
Overcurrent secondary protection relays are protection relays that measure phase and earth currents from the secondary circuit of current transformers and give a trip command to the circuit breaker when the set threshold is exceeded. They are used in medium voltage cells and main distribution panels to protect transformers, motors, generators and power lines against short circuits and earth faults. The category includes the Entes CKR-93T, with three phase inputs and one earth measuring input and an 85-265 V AC/DC auxiliary supply. Choose the number of phase and earth inputs, the measuring input suited to the current transformer secondary value, the auxiliary supply voltage, the tripping characteristic and the output contacts according to your protection coordination calculation. A secondary relay does not interrupt the fault current itself; it passes the trip command to the circuit breaker's shunt trip coil, so it does not replace the circuit breaker. The Overcurrent Secondary Protection Relays category on Welibaba includes 28 active models from leading manufacturers such as Siemens, Entes.
Key Technical Parameters for Selecting Overcurrent Secondary Protection Relays
To specify the right Overcurrent Secondary Protection Relays model for your panel or installation, verify the following parameters against your engineering schedule:
| Parameter | Typical Catalog Values | Verification Note |
|---|---|---|
| Product function and configuration | (RJ-45) IEC 61850 Edition 1 ve Edition 2 haberleşme protokolü ANSI 14, 37, 38, 46 | Verify against project schedule and load calculation |
| Product Type | Ark Koruma Ekipmanı, Koruma Rölesi, Koruma Sistemi Yardımcı Cihazı | Verify against project schedule and load calculation |
| Model | 6MD2320-0GA00-1AA0, 7PA2231-0, 7PA2632-1AA00-0, 7PA2732-0AA00-0 | Verify against project schedule and load calculation |
| IP Rating | IP40 (ön panel), IP50 | Verify against project schedule and load calculation |
Installation, Compatibility, and Commissioning Checklist
- Electrical & Mechanical Matching: Confirm that rated voltage, current capacity, and mounting dimensions align with the upstream and downstream components in Protection Relays.
- Environmental & Enclosure Rating: Check IP protection class, housing material, and terminal capacity for dusty, humid, or high-vibration industrial environments.
- Related Product Groups: If your application calls for a different form factor or rating, compare sibling categories such as Current Protection Relays, Phase Sequence Protection Relays, Phase and Motor Protection Relays.
Frequently Asked Questions
What is the first parameter to check when selecting Overcurrent Secondary Protection Relays?
Start by confirming the circuit's rated electrical values and physical mounting dimensions, then use the technical attribute filters on the Overcurrent Secondary Protection Relays page to narrow down compatible series.
Which Overcurrent Secondary Protection Relays brands are available on Welibaba?
Welibaba currently stocks 28 active models in this category from manufacturers including Siemens, Entes, complete with verified specifications and unit pricing.
How can I compare Overcurrent Secondary Protection Relays models by manufacturer part number?
You can search directly by manufacturer SKU/order code or use the category filter panel to compare equivalent models across brands side by side.