SD250LB-9 Albright 48V Maximum Emergency Stop Switch with Lock

 Albright International 250A 48 Volts DC heavy-duty emergency battery disconnect switch with lock, magnetic blowouts and continuous coil.

• The SD250 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 small and medium-size electric vehicles.
• 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.
• Rated at 250 amps, 48Vdc maximum current.
• Single pole.
• Internal fixing screws at 48mm centres.
• Two M8 hex bolts for battery cable fixing.

Dimensions

• 25mm diameter shaft clearance or panel hole.
• Total height including button: Approximately 170mm.

Body Beneath Panel Hole Dimensions

• Width: 62mm.
• Depth (excluding terminal bolts): 56mm.
• Length: 104mm.

About The Albright SD250LB-9 Emergency Stop Switch

 Typically used on 48 Volts DC systems as an emergency stop or kill switch.

 The SD250 has been designed to provide a rapid means of disconnecting batteries or other power supplies in the event of serious electrical faults.

 This lockable version features a key, which is necessary for the knob to be moved from the “Off” position to the “On” position. Once in the “On” position, the key can be removed. Thereafter, the knob may be depressed to the “Off” position where it will automatically lock and remain locked until the key is used again to unlock it.

 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.

 The SD250 has been designed to provide a rapid means of disconnecting batteries or other power supplies in the event of serious electrical faults.

 The SD250 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 small and medium-size electric vehicles.

 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.

Magnetic Blowouts

 These contactor switches are fitted with magnetic blowouts (denoted by 'B' suffix in the SD250B 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.

Specifications