Limit Switch

Limit Switch Air Balancer Series

KBA-LS – Cấu trúc xuyên suốt — **KBA-LS – Cutaway view**

Limit Switch Air Balancers

Series: KBA / KBC / RKBA / RKBC / TKBA / TKBC – LS

Knight external limit switch balancers incorporate up to two (2) spring-loaded plunger assemblies, two (2) limit switches and an external retract control — allowing a pneumatic pilot signal to be sent when a preset height is reached. A 5-way pneumatic valve is mounted on the bracket and is tripped by a position flag as the balancer travels upward.

The external retract control is an adjustable safety feature that controls vertical travel speed. It applies resistance to the thrust bearing so the cable or chain retracts slowly into the balancer, ensuring that a runaway load is stopped immediately and completely.

Air balancer sizing formula:
We recommend using 80% of capacity for lifting applications (to compensate for plant pressure fluctuations).
Example: 60 psi pressure, 350 lbs balancer → 0.60 × 350 × 0.80 = 168 lbs working capacity

Single LS Cable: KBA150-076-LS1/2 · KBA225-073-LS1/2 · KBA225-110-LS1/2 · KBA350-073-LS1/2 · KBA450-054-LS1/2 · KBA500-080-LS1/2 · KBA700-052-LS1/2

Single LS Chain: KBC150-070-LS1/2 · KBC200-110-LS1/2 · KBC225-067-LS1/2 · KBC350-067-LS1/2 · KBC450-052-LS1/2 · KBC500-080-LS1/2 · KBC700-052-LS1/2

Dual Chain SDS / RL Cable & Chain / Tandem: See the detailed specification tables below ↓

View real-world applications in the Knight Global photo gallery

Overview – Features & Benefits

Features

CE compliant
Cable or chain type
Hands-free operation
Standard "Float" mode
Requires clean, dry, non-lubricated air
Maximum load: up to 1,400 lbs [635 kg]
Standard travel: up to 110 in. [2,794 mm]

Benefits & Options

Sends a pilot signal at a preset height
Adjustable external retract control
Stops runaway loads immediately and completely
Optional High Relieving and Feathertouch controls
Multiple suspension kits available

Specifications – Single LS Cable

LS series single-cable air balancers

Model	Rated load lbs [kg]	Max. travel in. [mm]
KBA150-076-LS1	150 [68]	76 [1,930]
KBA150-076-LS2	150 [68]	76 [1,930]
KBA225-073-LS1	225 [102]	73 [1,854]
KBA225-073-LS2	225 [102]	73 [1,854]
KBA225-110-LS1	225 [102]	110 [2,794]
KBA225-110-LS2	225 [102]	110 [2,794]
KBA350-073-LS1	350 [159]	73 [1,854]
KBA350-073-LS2	350 [159]	73 [1,854]
KBA450-054-LS1	450 [204]	54 [1,371]
KBA450-054-LS2	450 [204]	54 [1,371]
KBA500-080-LS1	500 [227]	80 [2,032]
KBA500-080-LS2	500 [227]	80 [2,032]
KBA700-052-LS1	700 [317]	52 [1,320]
KBA700-052-LS2	700 [317]	52 [1,320]

Specifications – Single LS Chain

LS series single-chain air balancers

Model	Rated load lbs [kg]	Max. travel in. [mm]
KBC150-070-LS1	150 [68]	70 [1,778]
KBC150-070-LS2	150 [68]	70 [1,778]
KBC200-110-LS1	200 [91]	110 [2,794]
KBC200-110-LS2	200 [91]	110 [2,794]
KBC225-067-LS1	225 [102]	67 [1,701]
KBC225-067-LS2	225 [102]	67 [1,701]
KBC350-067-LS1	350 [159]	67 [1,701]
KBC350-067-LS2	350 [159]	67 [1,701]
KBC450-052-LS1	450 [204]	52 [1,320]
KBC450-052-LS2	450 [204]	52 [1,320]
KBC500-080-LS1	500 [227]	80 [2,032]
KBC500-080-LS2	500 [227]	80 [2,032]
KBC700-052-LS1	700 [317]	52 [1,320]
KBC700-052-LS2	700 [317]	52 [1,320]

Specifications – Dual Chain SDS LS

LS series dual-chain (SDS) air balancers

Model	Rated load lbs [kg]	Max. travel in. [mm]
KBC250S-054-LS1	250 [113]	54 [1,371]
KBC250S-054-LS2	250 [113]	54 [1,371]
KBC450S-052-LS1	450 [204]	52 [1,320]
KBC450S-052-LS2	450 [204]	52 [1,320]
KBC500S-084-LS1	500 [226]	84 [2,133]
KBC500S-084-LS2	500 [226]	84 [2,133]
KBC700S-052-LS1	700 [317]	52 [1,320]
KBC700S-052-LS2	700 [317]	52 [1,320]

RL Reeved Cable LS

Model	Load lbs [kg]	Travel in. [mm]
RKBA450-036-LS*	450 [204]	36 [914]
RKBA450-033-LS*	450 [204]	33 [818]
RKBA700-036-LS*	700 [318]	36 [914]
RKBA1000-040-LS*	1,000 [454]	40 [1,016]
RKBA1400-027-LS*	1,400 [635]	27 [685]

*When ordering, specify LS1 (1 switch) or LS2 (2 switches)

RL Reeved Chain LS

Model	Load lbs [kg]	Travel in. [mm]
RKBC400-055-LS*	450 [204]	55 [1,397]
RKBC450-33-LS*	450 [204]	33 [818]
RKBC700-033-LS*	700 [318]	33 [818]
RKBC1000-040-LS*	1,000 [454]	40 [1,016]
RKBC1400-026-LS*	1,400 [635]	26 [685]

Tandem Cable LS

Model	Load lbs [kg]	Travel in. [mm]
TKBA700-073-LS*	700 [318]	73 [1,854]
TKBA1000-080-LS*	1,000 [454]	80 [2,032]
TKBA1400-054-LS*	1,400 [635]	54 [1,371]

*When ordering, specify LS1 or LS2

Tandem Chain LS

Model	Load lbs [kg]	Travel in. [mm]
TKBC700-067-LS*	700 [318]	67 [1,701]
TKBC1000-080-LS*	1,000 [454]	80 [2,032]
TKBC1400-052-LS*	1,400 [635]	52 [1,320]

Cân bằng khí – Điều chỉnh chiều dài xích

Tổng hợp ứng dụng thực tế

BPA2113 Hook – Cài chốt vào mắt xích

Cân bằng tiêu chuẩn vs. Có bộ co rút ngoài

Lắp đặt móc cáp bộ cân bằng khí

Lắp đặt bộ cân bằng khí lên ray

Technical Documents (Brochure / Manual / Installation Guides)

Brochure

Knight Global Air Balancer Catalog (2026)

Manuals & Operating Instructions

Installation & Connection Guides

Accessories

General Accessories

Thước đo độ mòn xích<br /> Đo xích 4mm & 5mm — Chain Wear Gauge
For 4mm & 5mm chainKSAA1003
0.87 lbs [0.39 kg]
Gauge

Khóa xích an toàn<br /> Xoay 360°, kết nối nhanh — Safety Chain Shackle
360° swivel, quick connectionBPA2410
2.7 lbs [1.23 kg]
Shackle

Móc xích cân bằng khí nén<br /> Crosby® tự đóng, xoay 360° — Air Balancer Chain Hook
Crosby® self-closing, 360° swivelBPA2113
2.4 lbs [1.08 kg]
Hook

Khớp tháo lắp nhanh<br /> Xoay 360°, thép hợp kim — Quick-Disconnect Swivel
360° swivel, alloy steelBPA2035
4.8 lbs [2.22 kg]
700 lbs

Móc với khóa Bail & cổng khóa<br /> Lif-Lok®, dùng với KBA — Hook with Bail Lock & Latch
Lif-Lok®, for KBABPA2020
0.8 lbs [0.36 kg]
2000 lbs

Ròng rọc cáp đảo chiều<br /> Tăng gấp đôi công suất nâng — Reeved Cable Pulley
Doubles lifting capacityBPA2065
4.4 lbs [2.0 kg]
Reeved

Load Trolleys

Xe đẩy tải trọng – Ray RAD7510 — **Load Trolley – Rail RAD7510**MRTA7706
9 lbs [4.08 kg]
RAD7510 · 3000lbs

Xe đẩy tải trọng – Ray RAD6110 — **Load Trolley – Rail RAD6110**MRTA6106
6 lbs [2.72 kg]
RAD6110 · 1600lbs

Xe đẩy tải trọng – Ray RAD4110 — **Load Trolley – Rail RAD4110**MRTA4442
5 lbs [2.26 kg]
RAD4110 · 1100lbs

Xe đẩy tải trọng – Ray TR2000 — **Load Trolley – Rail TR2000**TRT2001
2 lbs [0.90 kg]
TR2000 · 550lbs

Xe đẩy tải – Dầm W/I/Patented — **Load Trolley – W/I/Patented Beam**RTA2013
23 lbs [10.4 kg]
W-Beam · I-Beam

Xe đẩy tải trọng – Dầm S — **Load Trolley – S-Beam**RTA2014
22.1 lbs [10.2 kg]
S-Beam

Safety Cable Kits

Bộ cáp an toàn móc mắt<br /> 4 kẹp Crosby® + 2 vòng đệm — Eye Bolt Safety Cable Kit
4 Crosby® clips + 2 thimblesFDA4133
6mm / 10 ft [3.048m]
Eye Bolt

Bộ cáp an toàn đầu bít oval<br /> 2 chụp đồng + 2 vòng đệm — Oval Sleeve Safety Cable Kit
2 copper sleeves + 2 thimblesNICORWA4133
2 lbs [0.91 kg]
Oval

Bộ cáp an toàn tiêu chuẩn<br /> Bộ tiêu chuẩn của Knight — Standard Safety Cable Kit
Knight standard kitRWA4133
6mm / 6 ft [1.8m]
Standard

Pneumatic Controls

Module cân bằng đơn<br /> Hỗ trợ trọng lượng ở zero-g — Single Balance Module
Supports the load at zero-gBCS2018
2.2 lbs [0.99 kg]
150lbs

Module High Relieving<br /> 2090: ≤250 lbs / 2322: ≤500 lbs — High Relieving Module
2090: ≤250 lbs / 2322: ≤500 lbsBCS2090 & BCS2322
10 ft [3m]
Heavy

Tay điều khiển Feather-Touch<br /> Ngang (2213) / Đứng (2214) — Feather-Touch Handle
Horizontal (2213) / Vertical (2214)BCS2213 & BCS2214
12.4 lbs [5.64 kg]
100lbs

Tay điều khiển cân bằng kép<br /> Hỗ trợ 2 trọng lượng zero-g — Dual Balance Control Handle
Supports 2 zero-g weightsBCS2215 & BCS2323
10.2 lbs [4.63 kg]
Dual

Pendant lên/xuống + Manifold Kit<br /> Thẳng (3017) / Xoắn (3320) — Up/Down Pendant + Manifold Kit
Straight (3017) / coiled (3320)BCS3017 & BCS3320
10 ft [3m]
Standard

Pendant Tandem lên/xuống<br /> Cho cân bằng Tandem & Dual — Tandem Up/Down Pendant
For Tandem & Dual balancersBCS2326 & BCS3330
10 ft [3m]
Tandem

FULL-SHARP AUTOMATIZED VN CO., LTD (FULLSHARP)
Authorized distributor of Knight Global air balancers and lifting equipment in Vietnam
For help selecting the right LS model (load capacity, travel, number of limit switches), please contact a FULLSHARP representative for a quotation and detailed drawings.