Uses an "Auto-puffer" system that reduces the energy needed for operation, enhancing the reliability of the spring mechanism.
It sounds like you’re referencing a specific technical manual code——which likely relates to a piece of industrial equipment, possibly a circuit breaker, transformer, or switchgear (given the “LTB” prefix, common in high-voltage products from manufacturers like ABB or similar). ltb 72.5-170d1 b manual
You can find detailed technical drawings and parts lists in the LTB D 72.5-170 KV FSA Spring Mechanism Manual or the General LTB Product Manual . Uses an "Auto-puffer" system that reduces the energy