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SW520-28M Albright 24V Magnetically Latched Busbar Contactor - Intermittent

£362.88 Excl. VAT
(£435.46 Inc. VAT)
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Despatch: 9 to 12 Weeks
Bar Code
Part Number
24V DC
Coil type
2 kg

Pre-order and back-ordering is available for all Albright out-of-stock items, with a current 9 to 12 weeks despatch.
Telephone: +44 (0) 1924 823119 or Email us to discuss further requirements.

 Albright International SW520-28M 24 Volts double-pole, single-throw 'magnetically latched' solenoid contactor, intermittent.

  • The SW520 is designed for use in telecommunications and power distribution applications where an uninterrupted current load is switched.
  • These contactors are primarily used with Direct Current loads but can also be used with Alternating Currents.
  • The SW520 features double-breaking main contacts with Silver-alloy tips which are weld resistant, hardwearing and have excellent conductivity.
  • Silver plating on the main contacts is standard for the SW500.
  • Magnetically latching contactor.
  • Yellow warning label fitted.
  • Side mounted auxiliary switch fitted.
  • Special operating knob and extension fitted.

Associated Parts

  • 2155-165 Vertical mounting bracket single (2 x recommended)
  • 2065-167A Horizontal mounting bracket kit (1 x recommended)

About Intermittent (INT.) SW520 Solenoids

 Intermittent contactors, by design, are predominantly used for hydraulic functions on vehicles; they make and break quicker than continuous solenoids and are not recommended for prolonged contact periods.

 The SW500 is a compact contactor that can be busbar mounted vertically or horizontally. If mounted vertically, the coil should be at the bottom.

 Magnetic Latching: The contact position is secured with the use of a permanent magnet within the assembly. The coil requires a pulse to close the contacts and a reverse polarity pulse to operate the armature and open the contacts, but otherwise remains in the last energised state without the need for power. It should be noted, therefore, these are not failsafe.

Uninterrupted current - no or infrequent load switching requirements (maintains a lower contact resistance).


Device Type NO - DP - ST.
Voltage 24Vdc
Coil Type Intermittent
Amps 500 Amps
Coil Resistance (Ohms) 12
Pull-In Voltage (V) 17.0 Max.
Drop Out Voltage (V) 17.0 Max.
Coil Power Dissipation (W) 48.00
Typical Pull-In Time 30ms
Typical Voltage Drop Per Pole
Across New Contacts At 500A
< 50mV
Operating Ambient Temperature -40 to +60℃
Weight 1.03kg
Application Uninterrupted
Thermal Current Rating 500A
Intermittent Current Rating:
30% Duty 915A
40% Duty 790A
50% Duty 705A
60% Duty 645A
70% Duty 600A


UK Mainland Postage Offer

Delivery Options Our Free UK Mainland Postage and Packaging Service offers unbeatable value for money. The free UK Standard shipping is automatically applied to your shopping cart page with no additional cost when you reach the £50.00 minimum order value.
We use Royal Mail Standard or Recorded Delivery for light, low-value orders and we use UPS, Parcel Force, and other major courier services for larger and more valuable consignments.

International Consignments

 Our international customers will need to provide the exact Card Holder Address (Invoicee) as the first address for payment processing. Please note that PO Box addresses are not acceptable as delivery addresses by some couriers. All export orders must be placed and paid for online. Proforma Bank Transfer IBAN and SWIFT payment methods are available to create online.

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