257B Time Mark Corporation, 257B Datasheet

257B

Manufacturer Part Number

257B

Description

Relay; SSR; Phase Monitor; SPDT; Cur-Rtg 10A; Ctrl-V 208/240AC; Vol-Rtg 240AC; Plug-In

Manufacturer

Time Mark Corporation

Datasheet

1.A257B.pdf (1 pages)

Specifications of 257B

Contact Form

SPDT

Current, Rating

10 A

Function

Phase Monitor

Mounting Type

Socket

Number Of Pins

Relay Type

Solid State

Standards

UL, CSA

Termination

Plug-In

Voltage, Control

208⁄240 VAC

Voltage, Rating

240 VAC

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

257B

Manufacturer:

AT&T

Quantity:

6 226

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

257BB

Quantity:

6 236

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DESCRIPTION

The Model 257 continuously monitors 3-phase power

lines

adjusted, the Model 257 monitor 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 electro-

mechanical relay. 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 monitor will automatically reset

(a manual reset version is also available).

The Model 257 does not require a neutral connection

and can be used with Wye or Delta systems. Voltage

ranges are sufficiently wide to allow for proper

adjustment to existing conditions. Both “TRIP” and

“NORM” condition indicators are provided to aid in

adjustment and system trouble-shooting.

TYPICAL APPLICATION

Detects phase loss, low voltage, phase reversal

50 Hz, 60 Hz and 400 Hz models

Automatic or manual reset

Five year unconditional warranty

3-Phase Monitor

for

abnormal

MODEL 257

conditions.

When

properly

SPECIFICATIONS

AUTO Reset

MANUAL Reset

Nominal AC voltage

(phase to phase)

Case Color

Adjustment range

Frequency

Power consumption

Transient protection

Repeat accuracy

Response time

Dead band

Output contacts

Expected relay life

Operating temp

Humidity tolerance

Enclosure material

Mounting

Weight

Agency approvals

DIMENSIONS

85-120vac 160-240vac 380-480vac 300-400vac 85-120vac 160-240vac

B257BM

120 vac

B257B

0.75W

60 Hz

Gray

*condition of acceptability: the 380V and 480V versions

must be used with a UL Recognized 600 VAC socket

208/240 vac

257BM

257B

60 Hz

1.5W

Red

SPDT 10 amps at 240 VAC resistive

Mechanical: 10 million operations

Electrical:

± 0.1% of set point (fixed conditions)

UL Recognized* and CSA Certified

8-pin socket ( **sold separately)

0 - 97% w/o condensation

Dust cover: ABS plastic

50 msec (set or reset)

2500 VAC for 10msec

A257BM

480 vac

A257B

Yellow

60 Hz

Approximately 2%

4.5W

-40° to +131° F

100,000 operations at rated load

5 ounces

** Order 8-pin socket number 51X120

EX257BM

EX257B

380 vac

Yellow

3.75W

50 Hz

B257B-400

B257BM-

120 vac

400 Hz

0.75W

Gray

400

208/240 vac

257BM-400

257B-400

400 Hz

1.5W

Red

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