Protector trip relay - Crompton Instruments - 250 Series - AC Current with Adjustable Time Delay

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Protector trip relay - Crompton Instruments - 250 Series - AC Current with Adjustable Time Delay

 

Features

- Single and three-phase options
- Adjustable set point
- Adjustable time delay
- Internal differential
- LED trip indication
- Double-pole relay contacts
- Automatic reset


 

Benefits

- Ideal for any electrical load detection
- Over and under-current monitoring
- Suitable for electric heating systems
- Ensures load current is within generator capacity
- Detects broken drive belts on machinery
- Nuisance tripping avoidance
- Customised options


 

Applications

- Marine panels
- Switchgear
- Distribution systems
- Generator sets
- Control panels
- Process control
- Motor protection
- Transformers
- Overload protection

 

Operation

AC current protectors provide continuous surveillance of the monitored circuit. These products offer user adjustable trip point (set point) and time delay settings. The set point adjustment range is between 40% and 120% of the nominal current. Input currents can be via current transformers or direct up to 10A. An internal differential setting of 1% reduces nuisance tripping if the measured signal is noisy or unstable. When the measured current moves outside the set point limit the relay will operate, giving an alarm or initiation signal. An adjustable time delay is provided to prevent the relay from tripping for a predetermined period to prevent nuisance tripping. The units draw their operating power from a separate auxiliary supply input. Single-phase and three-phase products are available. Three-phase products monitor the current level for each phase and are not phase sequence sensitive. Combined units offer under and over-current trips in one compact unit. Single function units are also available.

 

Over-Current Models

When the monitored current exceeds the set point, the relay will energise and the red LED will illuminate to indicate the trip condition. The relay will automatically reset once the monitored current falls below the set point minus the differential. When reset, the LED will extinguish and the relay de-energises.

 

Under-Current Models

When the monitored current falls below the set point, the relay will de-energise and the red LED will extinguish to indicate the trip condition. The relay will automatically reset once the monitored current rises above the set point plus the differential. When reset, the LED will illuminate and the relay energises.

 

Options

250 series protector relays offer various customised options to suit individual
requirements. Please consult factory.

- Adjustment ranges – different adjustment ranges are possible for the set point and differential controls.
- Relay operation – standard models are fail safe, but the relays can be customised to energise or de-energise on trip.


 

Product Codes

Relay Protection	ANSI no.	Cat. no.
1-phase Under-current 40-120%	37	252-PAU
1-phase Over-current 40-120%	51	252-PAO
1-phase Under and over-current	37/51	253-PAD
3-phase 3- or 4-wire Under-current 40-120%	37	253-PAV
3-phase 3- or 4-wire Over-current 40-120%	51	253-PAP

 

Specifications

Nominal input current	1A or 5A from CT secondary.
0.2A to 10A available	0.2A to 10A available on request
Nominal frequency	50, 60 or 400Hz
Input current burden	0.5VA per phase
Overload	2 x rating continuously, 10 x rating for 3 seconds
Set point repeatability	>0.5% of full span
Differential (hysteresis)	Pre-set at 1%. Values 1% to 10% available on request
Trip level adjustment	40 to 120%. Customised adjustment available
Time delay adjustable	0 to 10 seconds
AC auxiliary supply voltage	100V, 110V, 120V, 208V, 220V, 240V, 480V, ±20%
DC auxiliary supply voltage	12V, 24V, 48V, 110V or 125V, ±20%. Including ripple
Auxiliary voltage burden	4VA (max)
Output relay	2-pole change over
Relay contact rating	AC: 240V 5A, non inductive; DC: 24V 5A resistive
Relay mechanical life	0.2 million operations at rated loads
Relay reset	Automatic
Operating temperature	0°C to +60°C (0°C to +40°C for UL models)
Storage temperature	–20°C to +70°C
Temperature co-efficient	0.05% per °C
Interference immunity	Electrical stress surge withstand and nonfunction to ANSI/IEEE C37 90a
Enclosure style	DIN-rail with wall mounting facility
Material	Flame retardant polycarbonate/ABS
Enclosure integrity	IP50
Model 252 dimensions	55mm (2.2") wide x 70mm (2.8") high x 112mm (4.4") deep
Model 253 dimensions	75mm (2.9") wide x 70mm (2.8") high x 112mm (4.4") deep
Weight	Weight Model 252: 0.4Kg approx. Model 253: 0.6Kg approx.

 

Dimensions

Model 252




Model 253

 

Connections

- 252-PAU
- 252-PAO




- 253-PAD



- 253-PAP
- 253-PAV




 

Danh mục sản phẩm

System	Input	Aux. Power	Protection	Catalog Number
AC Current (Adjustable time delay 0-10 sec., fixed hysteresis 1%)
Single Phase	5A	120V	Under current 40-120%	252-PAUU-LSBX-C6-DG-D1-EB
Single Phase	5A	120V	Over current 40-120%	252-PAOU-LSBX-C6-DG-D1-EA
Single Phase	5A	120V	Under & Over current	253-PADU-LSBX-C6-DG-D1-EC
3 Phase 3 or 4 Wire	5A	120V	Under current	253-PAVU-LSBX-C6-DG-D1-EB
3 Phase 3 or 4 Wire	5A	120V	Over current	253-PAPU-LSBX-C6-DG-D1-EA