The Spring Tensioning Device for Overhead Contact System (STeDOCS) in Electric railway is a new patent product. It is a great revolution on performance and efficiency compared with the conventional pulley/ratchet counterweight or hydraulic-pneumatic compensation device. It is an ideal replacement for existing products! STeDOCS is used for automatically compensating the length changes of catenary & contact wires, which are caused by various environmental factors.Model Nominal tension Rated tension Rated elongation Key dimensions Mass of the body Inch(mm) lbs (kN) lbs (kN) Inch(mm) L L1 Connecting pin lbs (kg) JW8.5 1900 (8.5) 1850 (8.3) 0~51 (1300) 20.0 (510) 10.2 (260) φ 1.18 ( φ 30) 200 (92) JW10 2250 (10) 2200 (9.8) 0~51 (1300) 22.5 (570) 12.6 (320) φ 1.18 ( φ 30) 260 (117) JW12 2700 (12) 2600 (11.8) 0~51 (1300) 24.8 (630) 14.6 (370) φ 1.18 ( φ 30) 285 (130) JW13 2900 (13) 2800 (12.8) 0~51 (1300) 26.8 (680) 16.9 (430) φ 1.18 ( φ 30) 315 (130) JW15 3400 (15) 3300 (14.7) 0~51 (1300) 29.1 (740) 18.9 (480) φ 1.18 ( φ 30) 350 (157) JW16 3600 (16) 3500 (15.7) 0~51 (1300) 29.1 (740) 18.9 (480) φ 1.18 ( φ 30) 350 (157) JW17 3800 (17) 3700 (16.7) 0~51 (1300) 31.1 (790) 21.3 (540) φ 1.18 ( φ 30) 375 (170) JW20 4500 (20) 4400 (19.6) 0~51 (1300) 33.5 (850) 23.6 (600) φ 1.18 ( φ 30) 420 (192) JW24 5400 (24) 5300 (23.5) 0~51 (1300) 37.8 (960) 28.0 (710) φ 1.18 ( φ 30) 485 (220) JW25 5600 (25) 5500 (24.5) 0~51 (1300) 37.8 (960) 28.0 (710) φ 1.18 ( φ 30) 485 (220)
