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Seaward Powertest 1557 Multifunction Installation Tester

Seaward Powertest 1557 Multifunction Installation Tester
sku: SEAMT3
MPN: 328A916

Free UK Delivery On Orders Over £40
  • Handheld instrument perfect for use on the move
  • Used by numerous industries for basic but reliable loop testing in just five seconds
  • Can be used with a range of accessories to ensure total accuracy

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Seaward Powertest 1557 Multifunction Installation Tester Details

*** Please note that this product has been discontinued. We apologise for any inconvenience this may have caused. ***

Made for electrical contractors, electrical engineers and ideal for use in training institutions, the Seaward Powertest 1557 is an entry-level, low-cost multifunction electrical installation tester.

Designed and manufactured in Britain by Seaward. This tester will perform all basic electrical checks, including earth continuity, insulation (with voltages of 100V, 250V and 500V), non-trip loop impedance, line impedance, RCD trip current and basic voltage/frequency measurements.

Testing with the Powertest 1557 is simple - just turn the rotary dial on the front to the test you want, then activate using the test button on the front of the tester. As standard the 1557 also includes Seaward's uniquely-designed cordless probe - with this, you'll be able to activate testing procedures using the probe itself, freeing up your hands to work more efficiently.

The Powertest 1557 is one of the smallest and lightest multifunction testers on the market. It's actually small and light enough to be easily held in one hand!

Seaward Powertest 1557 Multifunction Installation Tester Key Features

  • Earth Continuity testing with test current of >200mA
  • Insulation resistance testing with selectable ranges of 100, 250 and 500V
  • Loop/line impedance testing
  • RCD trip time testing
  • RCD trip current testing
  • Voltage/frequency measurements
  • Unique cordless probe
  • Simple to use
  • Analogue and digital display
  • Doesn't trip RCD when performing loop impedance testing

Full List of Products Included

  • Seaward Powertest 1557 Multifunction Installation Tester
  • 6 x 1.5V Cells LR6 Type AA Alkaline Batteries
  • Test Lead, 1.5M 13A UK Plug to Red, Black, Green 4mm Shrouded Safety Plugs
  • Alligator Clips: Red, Black, Green
  • Test Lead Set, 1,5M Red, Black, Green 4mm Shroded Safety Plugs to Red, Black, Green 4mm Shrouded Safety Test Probes
  • Red Cordless 4mm Shrouded Safety Test Probe
  • Manufacturer's Calibration Certification 
Accessories (1)

Seaward Powercheck 1557 Calibration Checkbox
Seaward Powercheck 1557 Calibration Checkbox SKU:POWERCHECK
£526.00 Incl. VAT £631.20
Technical Specs

Part Code: 328A916

Seaward Powertest 1557 Technical Specifications

Earth Continuity  
Test Current >200mA
Display Range 0Ω to 199Ω
Resolution 0.01Ω max
Test Lead Compensation Null lead resistance: 0Ω to 10Ω
Live Circuit Detection Test inhibit if >30V detected
Insulation Resistance
Test Voltage 100V, 250V, 500V
Display Range 0.05MΩ to 199MΩ
Resolution 0.01MΩ max
Live Circuit Detection Test inhibit if >30V detected
Loop/Line Impedance  
Supply Voltage 195 - 253V/400V, 45Hz - 65Hz
Test Current 15mA (non-tripping for RCD-protected circuits)
Display Range 0.01Ω to 2000Ω
Resolution 0.01Ω max
Loop Impedance Phase to earth
Line Impedance Phase to neutral/phase to phase
PFC/PSC Range 0 to 26kA
RCD Trip Time
Supply Voltage 195 - 253V, 45-65Hz
Test Currents 10, 30, 100, 300, 500mA
Trip Time Ranges 0ms to 2000ms at 1/2 Irn
0ms to 300ms at Irn general
0ms to 500ms at Irn selective
0ms to 40ms at 5x Irn
Auto Test Auto sequence for 1/2 Irn, Irn and 5x Irn at 0 and 180°
RCD Type General (G), selective (S), Pulsed (A), AC (AC)
RCD Trip Current
Supply Voltage 195 to 253V, 45-65Hz
Test Currents 10, 30, 100, 300, 500mA
Ramp Current Range 1/2 Irn to 1.1 Irn
Voltage/Frequency Measurement
Display Range 0 to 440V
Resolution 1V
Frequency 45-65Hz
General Specs  
Compliance IEC 61010-1 300V CAT III, EN 61557
Dimensions 260 x 100 x 55mm
Weight 950g

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Good quality at great value

Review by Philip Crabtree (Posted on 05/03/2018)


Great value for money and meets 17th edition

Good product , easy to learn to use

Review by John Carter (Posted on 19/05/2017)


Just started my own business and bought this and its sister , the PAT tester together . Great !

Good entry level tester needs better leads

Review by A Reay (Posted on 29/03/2017)


Good tester for someone starting out on domestic electrics . I got this as a spare for my megger 1730. It's a good tester but budget for better leads as the ones supplied are not very good

Seaward MFT

Review by Gary (Posted on 29/06/2014)


Very pleased with the product, starting out on my own; so value for money is a must at the moment. Good service.

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