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Allen Bradley 840 Switches 840-B4

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840-B4

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The 840-B4 from Allen Bradley serves as an automatic float switch designed for industrial applications. This robust switch operates effectively in demanding environments, featuring a heavy-duty design to withstand challenges associated with maintaining fluid levels.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 840-B4

ManufacturerAllen Bradley
Product TypeAutomatic Float Switch
Product Line840 Switches
Part Number840-B4
Weight4.19 lbs (1.90 kg)
UPC781180905766
StyleStyle B - Heavy Duty Industrial Switch
Enclosure MaterialType 4 Fiberglass Polyester
Contact Configuration1 Normally Open (N.O.) + 1 Normally Closed (N.C.)
Maximum Contact Rating60 A
Mounting TypeOpen Tank Mount
Maximum AC Voltage Rating600V AC
Maximum DC Voltage Rating250V DC
AC Horsepower (HP) Rating1/2 HP
AC Full Load Amps7.2 A
Pilot Duty Rating1200 VA
Conduit Connection1/2 in. NPT
Operating Ambient Temperature-30°C to +66°C
Storage Temperature-30°C to +93°C
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The Allen Bradley 840-B4 is engineered as a reliable automatic float switch suitable for industrial settings. Rated for heavy-duty use, it incorporates a contact configuration which includes one normally open (N.O.) and one normally closed (N.C.) contact. The switch can manage a substantial contact rating of up to 60 amps. This unit can be mounted on open tanks, perfectly suited for applications requiring precise fluid level control.

Constructed with a Type 4 fiberglass polyester enclosure, it ensures durability in harsh environmental conditions. The 840-B4 operates at a maximum AC voltage of 600V and can withstand a maximum DC voltage of 250V. It supports an AC horsepower rating of 1/2 HP and accommodates an AC full load current of 7.2 amps. With a pilot duty rating reaching 1200 VA, this switch is well-equipped for controlling various electrical loads.

For installation, the conduit connection is set at a 1/2 inch NPT, simplifying integration into existing piping systems. It operates effectively in an ambient temperature range spanning -30°C to +66°C, while it can be stored safely in conditions between -30°C and +93°C without compromising functionality.