Current Protection Relays Selection Guide: Technical Criteria & Application Standards
Current Protection Relays selection guide: technical parameters, mounting and compliance standards, and Tense, Entes, Schneider Electric comparison.
Current protection relays are electronic relays that continuously measure the load current and change the position of the output contact when the current goes outside an adjustable upper or lower threshold and the delay time has elapsed. They are used to disconnect the contactor against overload and jamming in motors and against the low current caused by dry running in pumps. The category includes Entes AKC series overcurrent and undercurrent relays, Tense TRM digital thermal overload relays and KON-TER models with a built-in contactor; current setting ranges such as 1-25 A, 15-50 A and 190-300 A are examples. Choose the protection direction (overcurrent or undercurrent), the current setting range, direct or current transformer connection, the delay time and the operating mode (automatic, semi-automatic or manual) according to the motor's rated current and the application. Current protection relays are not designed to interrupt short-circuit current; they do not replace a fuse or circuit breaker. The Current Protection Relays category on Welibaba includes 20 active models from leading manufacturers such as Tense, Entes, Schneider Electric.
Key Technical Parameters for Selecting Current Protection Relays
To specify the right Current Protection Relays model for your panel or installation, verify the following parameters against your engineering schedule:
| Parameter | Typical Catalog Values | Verification Note |
|---|---|---|
| Current Setting Range | 0.5 - 5A(AC), 0.5–30 A, 15–50 A, 190–300 A | Verify against project schedule and load calculation |
| Inputs and Outputs | Kontak çıkışı (NA, NC, COM), Kontak çıkışı (NK | Verify against project schedule and load calculation |
| Delay Time | 0, 1 sn. - 20 sn, 0, 1 sn. - 200 sn | Verify against project schedule and load calculation |
| Key Features | 0, 1A – 25A (Ayarlanabilir Termik Değeri); 50% Sabit Akım Asymmetry; Hata Gecikme Zamanı Ayarlabilir; Çalışma Modu Ayarlanabilir (Otomatik, Yarı-Otomatik, Manuel); Dahili Akım Trafolu | 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 Overcurrent Secondary Protection Relays, Phase Sequence Protection Relays, Phase and Motor Protection Relays.
Frequently Asked Questions
What is the first parameter to check when selecting Current Protection Relays?
Start by confirming the circuit's rated electrical values and physical mounting dimensions, then use the technical attribute filters on the Current Protection Relays page to narrow down compatible series.
Which Current Protection Relays brands are available on Welibaba?
Welibaba currently stocks 20 active models in this category from manufacturers including Tense, Entes, Schneider Electric, complete with verified specifications and unit pricing.
How can I compare Current 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.