Liebherr has released two new electric crawler excavators for mine and quarry extraction.

Liebherr said the R 976-E electric crawler excavator and the R 980 SME-E were not just converted diesel machines. The excavators and their electric power system were designed and produced entirely by Liebherr.

The machines weigh 90 and 100 tonnes respectively and are available in backhoe and shovel versions.

They stand out for their low noise level, optimum versatility and zero CO₂/greenhouse gas emissions during operation, according to a statement by the manufacturer.

“The robustness, reliability and cost-effectiveness of the R 976-E and R 980 SME-E make them products of choice for environmentally friendly extraction applications,” it said.

Related: Volvo CE unveils mid-size electric excavator concept

Reduced maintenance and lower operating costs make an electric excavator more cost-effective than a diesel-engine machine.

The technology used in the R 976-E and R 980 SME-E offers a host of advantages. Thanks to its constant speed whatever the load, an excavator with an electric engine promises a longer service life.

The engine features heat shielding on bearings and motor windings. Integrated into a frame with a reinforced flange, it enables safe, soft starting.

The two robust electrical cabinets are assembled by welding into a structure specifically designed to withstand extreme working conditions.

Lockable watertight (IP 65) doors are fitted with safety switches and an emergency stop.

The high-voltage cabinet is a dedicated contact for power connection and voltage transformer, while the low voltage cabinet is used for power connection monitoring.