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ED252

EMERGENCY DISCONNECT

The ED252 range of switches have been designed to provide a rapid means of disconnecting batteries or other power supplies in the event of serious electrical faults.  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.

The ED252 is a manually operated device with an over-centre spring mechanism which provides a snap action for both opening and closing of the main contacts.  The ED252 is easy to install (see drilling details) and is secured with supplied M5 posidrive mounting screws.  Lockable versions feature 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 ED252 is fully serviceable with genuine replacement parts available.

Precautions:

When fitted with magnetic blowouts the polarity marked on the contact housing must be observed when connecting the main terminals.  Ensure that the switches are installed in a position where heavy arcs emanating from the switch cannot damage or electrically jump across to adjacent parts.  The switch is to be used to rupture current in an emergency or as a no-load isolator.

Do not use as a regular On-Load Switching Device.

ED252 Technical Information

Application
InterruptedRating ( Ith )Uninterrupted
Thermal Current Rating 250A 250A
Intermittent Current Rating:
30% Duty 275A 455A
40% Duty 235A 395A
50% Duty 210A 355A
60% Duty 195A 325A
70% Duty 180A 300A
Rated Fault Current Breaking Capacity (Icn) 5ms Time Constant: (In accordance with UL583*)
Blowouts 1500A at 96V D.C.
No Blowouts 1500A at 48V D.C.
Rated Fault Current Breaking Capacity (Icn) Resistive Load: (In accordance with UL508*)
Blowouts -
No Blowouts -
Maximum Recommended Contact Voltages
Blowouts 96V -
No Blowouts 48V -
Typical Voltage Drop per pole across New Contacts at 250A 40mV

Mechanical Durability > 100,000 Cycles
Coil Voltage Available (Us) (Rectifier board required for A.C.) 0 - 0V

ED252 Features

Component Configurations
Auxiliary
STANDARD

ED252 Resources

ED252 Data Sheet

  • Format: .pdf
  • Size: 1,151kb

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  • The ED252 has the following optional components available: