2-1618398-1

**Protective Relays** 

## **20-000 Series** 

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The output contacts of frequency relays are energized when the frequency exceeds the adjustable set point. Overfrequency and underfrequency relays are available in 50, 60 and 400Hz. Combination over/ underfrequency “band pass” relays are also available. These are energized at rated frequency and de-energized during overfrequency or underfrequency conditions. Frequency Differential relays are energized between the preset frequencies. The pick-up and drop-out frequency settings are independently adjustable. 

**Note:** Dimensions in inches. Multiply values by 25.4 for dimensions in mm. 

## **Product Specifications** 

**Input Voltage (±10%)** — 120 VAC, Single Phase **Frequencies Range (adjustable)** — See Ordering Information **Differential** — Frequency pick-up to drop-out differential is 1% max **Temperature Range** — -40°C to +85°C 

**Temperature Drift** — ± 1% frequency error over temperature range **Voltage Error** — ± 1% for input voltage of 120 VAC ± 10% 

**Contact Ratings** — 5 amp resistive at 120 VAC or 28 VDC **Output Contacts** — One set N.O., one set N.C. 

## **Notes:** 

1.  Remove screw for access to trip adjustment. 

## **Operation** 

The normally open contacts close, and the normally closed contacts open, at all frequencies above the set point. The contacts in the connection diagram, are shown in the de-energized position (below the trip set point). 

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## **Ordering Information** 

> **Sample Part Number** > **20 -050 X Type:** 20 - Frequency **Frequency Range** 040 = 40-50 Hz 050 = 50-60 Hz 060 = 60-70 Hz 350 = 350-500 Hz 400 = 400-450 Hz ~~|~~ **Mounting Options** X = Flange blank = Stud 

**Consult factory for additional models.** 

AEROSPACE, DEFENSE & MARINE /// HIGH PERFORMANCE RELAYS