A252B Time Mark Corporation, A252B Datasheet

A252B

Manufacturer Part Number

A252B

Description

Relay; SSR; Phase Monitor; SPDT, SPST-NO; Cur-Rtg 5A; Ctrl-V 480AC; Vol-Rtg 240AC

Manufacturer

Time Mark Corporation

Datasheet

1.A252B.pdf (1 pages)

Specifications of A252B

Contact Form

SPDT, SPST-NO

Current, Rating

5 A

Function

Phase Monitor

Mounting Type

Socket

Number Of Pins

Relay Type

Solid State

Standards

cULus

Termination

Plug-In

Voltage, Control

480 VAC

Voltage, Rating

240 VAC

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l Detects Phase Loss, Low Voltage

l 50 Hz and 60 Hz versions

l Automatic Reset

Control

Voltage

DESCRIPTION

The Model 252 3-Phase Monitor continuously monitors

3-phase power lines for abnormal conditions.

properly adjusted, the Model 252 will detect phase loss

on a loaded motor even when regenerated voltage is

present.

This device consists of a solid-state voltage and phase-

angle sensing circuit, driving an electromechanical relay

with one SPDT and one SPST contact. When correct

voltage and phase rotation are applied, the internal

relay will energize. A fault condition will de-energize the

relay. When the fault is corrected the Model 252 will

automatically reset.

The Model 252 does not require a neutral connection

and can be used with WYE or DELTA configured

systems. Four versions cover 120V, 208/240V and

480V, 60Hz, and 380V, 50Hz. Adjustment ranges are

sufficiently wide to allow for proper adjustment to

existing conditions. Two LED indicators are provided to

aid in adjustment and system troubleshooting.

TYPICAL APPLICATION

3-Phase Monitor

and Phase Reversal

3 4 5

Model

252

MODEL 252

6 1

Stop

Start

Shows No Power Applied

O/L's

MOTOR

Remote

Indicator

Lamp

When

SPECIFICATIONS

DIMENSIONS

Model

Nominal AC Voltage

Adjustment Range

Frequency

Power Consumption

Transient Protection

Repeat Accuracy

Response Time

Reset Time

Reset Type

Dead Band

Output Contacts

Contact Rating

Expected Relay Life

Operating Temp

Humidity Tolerance

Enclosure Material

Mounting

Weight

Agency Approvals

*Order 8-pin socket number 51X120

85-120VAC 160-240VAC 380-480VAC 300-380VAC

120VAC

B252B

0.25 W

0.1% of set point (fixed conditions)

UL Recognized (U.S. & Canadian)

Mech:

Elec:

8-pin socket (*order separately)

1 - SPDT

208/240VAC

5A at 240VAC resistive

97% w/o condensation

0.50 W

60 Hz

252B

2500V for 10 msec

- 40º to 131º F

0.05 seconds

ABS plastic

10 million operations

100,000 at rated load

Automatic

5 oz.

1 - SPST (N.O.)

480VAC

A252B

1.5 W

EX252B

380VAC

1.25 W

50Hz

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