SD300AB-2 Albright Emergency Stop Switch with Auxiliary 24V Maximum

£74.50  Excl. VAT
  (£89.40 Inc. VAT)

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1 in stock

Weight:  950g

Model:  SD300AB-2
Bar Code:  DNA
Part Number:  SD300AB-2
Brand:  Albright
Colour:  Black/Red
Voltage:  12V/24V DC
Amperage:  300A
Material:  Copper/Silver/Bakelite
Coil type:  Continuous

Pre-order and back-ordering are available with a 6 to 8 week lead time. Telephone: +44 (0) 1924 823119 or Email us to discuss further requirements.

 Heavy duty emergency battery disconnect switch with auxiliary and magnetic blowouts.

  • Rated at 300A, 24V DC maximum current.
  • Single pole.
  • Internal fixing screws at 48mm centres.
  • Two M8 hex bolts for battery cable fixing.

Magnetic Blowouts

 These contactor switches are fitted with magnetic blowouts (denoted by 'B' suffix in the SD300B range) across contact gaps. These enable high currents to be ruptured very quickly so that arcing time is reduced to a minimum. Fitting of blowouts can make the contacts polarity sensitive and the positive markings on the cover of the contactor must be observed.

About the Albright SD300 Emergency Stop Switch

 The SD300 combines the dual function of a manual disconnect and coil operated line contactor. The benefits of this design include compact size and reduced installation costs combined with an electrical capacity sufficient for most small and medium size electric vehicles..

 The SD300 has been designed to provide a rapid means of disconnecting batteries or other power supplies in the event of serious electrical faults.

 The operation of the switch is such that with the operating knob depressed i.e. in the “off” position, no electrical functions can take place. However, if the knob is in the “On” position, the option of energising the coil and thus closing the main contacts becomes available. The coil energisation can be carried out either through the vehicle keyswitch or as a result of a signal from the vehicle electronic controller. When used as an emergency battery disconnect switch, manually depressing the operating knob will override the energised coil such that the main contact and the auxiliary contact (where fitted) will open until such time as the knob is again moved to the “on” position.

 Whilst the switches are primarily intended for use with battery powered vehicles, they are also suitable for use with static power systems. All types are capable of safely rupturing full load battery currents in the event of an emergency.

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


Application Uninterrupted
Device Type SP On-Off with Manual Disconnect
Coil Voltage 24V Maximum
Coil Type Continuous
Thermal Current Rating (Ith) 300 amp
Intermittent Current Rating 30% Duty 545A
40% Duty 475A
50% Duty 425A
60% Duty 385A
70% Duty 360A
Coil Resistance (Ohms) 44
Pull-In Voltage (V) 16.0 Maximum
Drop Out Voltage (V) 6.0 Maximum
Coil Power Dissipation (W) 13.09
Typical Voltage Drop Per Pole
Across New Contacts At 300A
Operating Ambient Temperature -40 to +60℃
Weight 850g


Free UK Mainland Postage and Packaging

Delivery Options Free UK Mainland delivery discount is selectable on your shopping cart page; a £50.00 minimum order value is applicable for the Free Delivery Service, with a variable low Standard Rate shipping charge for smaller consignments.
 Despatch methods for Standard and Free UK Delivery Service include light, low-value orders despatched via Royal Mail standard or recorded delivery, with large and high-value orders despatched via UPS and Parcel Force courier services.

International Consignments

 International orders and consignments require the exact Card Holder Address (Invoicee) as the first address for payment processing. PO Box addresses are not acceptable as delivery addresses by some couriers.
 Export orders will only be accepted when placed online.

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