1618104-4

**Protective Relays** 

**11** 

## **WC3 & WCT3 Series, Overcurrent** 

## **Product Facts** 

n **Function 50/51** TERMINAL STRIPS #6 - 32 SCREWS n **ANSI/IEEE C37.90-1978** %, . Ron » n **UL File No. E58048 R** 3 6.2 SG Tee n **CSA File No. LR61158 R** A o BK er oe gS ° Ph 4 : oroya é ”% ~ 3.0 eS “a? Lg OF Ae 4% Current sensitive relays oat, ® are available for single and three phase applications. e . Voltage controlled overcurrent relays protect generators against fault currents below the full rated value, when the fault produces a **See previous page for** voltage drop as in the case **WC Can Dimensions** of short circuits or grounds. Phase balance relays are NYia available to sense and control unbalanced current flow in three phase systems. Current differential relays **Note:** Dimensions in inches. Multiply values by 25.4 for dimensions in mm. operate when the differential between two currents A aa **Time Delay** exceeds preset values. 5 a **Standard Time Delay** Over/under current et f **t** e an **(WC3 Series)** — A fixed inverse time phase-band relays are CT delay is incorporated in all overcurrent also available. ee ee ee ee ae a ae relays and is represented by the typical 11/64" DIA. 4 MTG. HOLES 

**(WC3 Series)** — A fixed inverse time delay is incorporated in all overcurrent relays and is represented by the typical curves shown. 

## **Product Specifications** 

**Line Current** — Three Phase, AC current, 50-400 Hz Direct or from CT **Control Voltage** — See Ordering Information 

**Trip Point** — Screwdriver adjustable. Adjustment range in accordance with ordering information. 

**Pick-Up to Drop-Out Differential** — Approximately 0.1 amp 

**Overcurrent Allowance** — Maximum of 500% for 0.25 seconds 

**Surge Withstand Capability** — In compliance with the requirements of ANSI/IEEE 

**Operating Temperature** — -40°C to +70°C 

**Temperature Drift** — ± 0.05%/°C **Burden** — Current input — 1.2 VA, Control voltage — 2.5 VA **Contact Ratings** — One set, N.O., One set N.C. 5 amp resistive at 120 VAC or 28VDC 

- **Notes:** 1.  Remove black  screws for access to the current pick-up and the time delay  adjustment. 

2.  Clockwise rotation of the pick-up adjustment  will raise the current trip point. 

3.  Clockwise rotation of the time delay adjustment, (Type WCT3 only) will increase the time delay. 

|| || **Adjustable Time Delay** 

**(WCT3 Series)** — The time delay is 

field adjustable.  The standard time delay can be increased by any value between 

0.5 and 20 seconds. 

## **Ordering Information** 

**Sample Part Number** 

**Type:** WC3 = Per Time Curves WCT3 = Adjustable Time Delay **Control Voltage (± 15%)** 26 DC 48 DC 125 DC 120 AC 230 AC 380 AC 460 AC 

## **WCT3 -48DC -5 A** 

## **Typical Curves (WC3 Series)** 

**==> picture [236 x 137] intentionally omitted <==**

**----- Start of picture text -----**<br>
8<br>6<br>4<br>20 [Sf<br>0 0.1 0.2 0.3 0.4<br>Pick-Up Time Delay<br>Current (amps)<br>**----- End of picture text -----**<br>


## **Trip Adjustment Range** 

1 = .2 amp - 1 amp 5 = 1 amp to 5 amp 

10 = 2 amp to 10 amp 

## **Other Options** 

- A = Two normally open contacts B = Two normally closed contacts 

**See previous page for 1-phase models and consult factory for additional models.** 

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