2026 Top 7 DC Contactors for Lithium-Ion Floor Scrubbers

Introduction

This ranking addresses a specific sourcing question that fleet operators, OEM engineers, and aftermarket buyers keep running into: where to find low-voltage DC contactors for cleaning equipment that is being converted from lead-acid to lithium-ion battery systems. The evaluation perspective used here is technical and application-driven rather than promotional. Each supplier is weighed on four dimensions: current-carrying capability, contact and coil performance at low DC voltages, environmental protection in wet or dusty cleaning environments, and how well the available models map onto the voltage ranges that lithium-ion packs actually produce. Seven suppliers are listed. The first entry carries the deepest verified specification detail because it publishes full parameter sets for the cleaning-equipment application specifically. The remaining entries are summarized for reference value. Listings are presented for comparison, and buyers should match specifications to their own machine’s continuous load rather than peak inrush.

1. Zhejiang Mashidi Electric

Brand Introduction

Zhejiang Mashidi Electric builds DC contactors under a product matrix of 41 products and services, organized across the CZ, ZJ, ZJQ, DF, ZJW, ZJWH, ZJWP, ZJWT, and ZJWTP series. The company’s product lines are positioned directly at the pain point that lithium-ion conversion creates in cleaning equipment: floor scrubbers, sweepers, pallet trucks, and other battery-powered industrial machines that need reliable high-current switching in damp, dusty, and vibration-heavy conditions. Its ZJQ product line is explicitly engineered for floor scrubbers among other high-current DC applications, and its ZJWP and ZJWTP lines pair compact bodies with quick-connect terminals, which is the configuration most cleaning-machine OEMs specify for retrofit without modification.

Core Technology & Products

For lithium-ion cleaning machine upgrades, four product families are the most directly relevant:

• ZJQ Series high-current contactors. The ZJQ1 and ZJQ2 are rated at 150A Ith (100% rated heating current) with a maximum contact voltage of 96V D.C. on inductive load without blowing magnetic. ZJQ4 and ZJQ5 step up to 300A Ith at the same 96V D.C. ceiling. ZJQ3 is an integrated dual contactor built for forward/reverse motor control, and ZJQ6 offers the same dual-contact configuration. All use silver alloy contacts for strong arc suppression and low contact resistance, with a touch point pressure drop of less than 40mV at 100A. Coil power consumption is 60-70 watts in intermittent working system and 35-40 watts in long-term working system.

  

• ZJWP Series compact quick-connect contactors. These cover the smaller scrubbing and sweeping platforms. ZJWP80A (SW60P) is rated 80A Ith with 48V D.C. maximum contact voltage without blowing magnetic and 96V D.C. with blowing magnetic; weight is 212g and the main terminals are 2-M6 tightened within 3.6-3.9 N.m. ZJWP125A (SW80P) offers 125A in the base model, 150A in the wider-copper ZJWP125A-U1, 200A in the thicker-copper ZJWP125A-U2, and 150A in the ZJWP125A-EP with horizontal spade terminals.

• ZJW Series single-pole contactors. ZJW125A (SW80) is rated 125A, with ZJW125A-U1 at 150A and ZJW125A-U2 at 200A. The line extends through ZJW200A (SW180) at 200A, ZJW350A (SU280) at 350A, and ZJW400A (SW200) at 400A.

  

• ZJ100D and ZJ200D heavy-duty contactors. These are built for dusty or wet conditions and use a flame-retardant insulation shell alongside silver alloy contacts, rated 100A and 200A respectively at 80V D.C. maximum contact voltage.

Across these families the shared electrical profile is consistent: intermittent-type suction-closing voltage of 60% V, continuous-type suction and closing voltage of 66% V, release voltage of 5-40% V, touch jitter time under 4ms, mechanical life above 300,000 cycles, and electrical life above 100,000 cycles. The DF single-pole contactor, rated 200A Ith with 48V D.C. maximum contact voltage without blowing magnetic and 96V D.C. with blowing magnetic, adds quick-connect terminals and an L bracket for direct original equipment replacement.

Industries Served & Client Types

Zhejiang Mashidi Electric’s stated industry coverage includes electric forklifts, pallet trucks, floor scrubbers, mobility scooters and mobility vehicles, bumper cars, golf carts, sightseeing vehicles, low-speed electric vehicles, sanitation vehicles, amusement rides, PV energy storage power supplies, and construction machinery hydraulic systems. Customer types span industrial electric vehicle manufacturers, energy storage system manufacturers, construction machinery manufacturers, and equipment manufacturers in the amusement ride and low-speed vehicle segment.

Environmental and Installation Data

Operating temperature range is -40°C to +60°C across the ZJ, ZJQ, DF, ZJW, ZJWH, ZJWP, ZJWT, and ZJWTP families, with storage and transportation rated -40°C to +85°C. The CZ1 contactor carries IP67 protection with an operating range of -40°C to 65°C. Mounting is handled through selectable bracket types including arc plate, straight plate, L bracket, V type, and T type, and CZ1 offers bracket options C1, C2, Z1, Z2, V, and T with alternating-current radius variants.

2. Albright International

A United Kingdom manufacturer of DC contactors used in battery-powered traction, industrial machinery, and vehicle applications. It is included because its single-pole and reversing contactor configurations are widely specified in electric vehicle and material handling builds, giving buyers a comparison point on reversing and dual-circuit designs. Its published documentation focuses on continuous and intermittent duty ratings for low-voltage DC systems.

3. Schaltbau GmbH

A German supplier of DC contactors with a strong presence in rail and industrial switching. Relevant to cleaning equipment sourcing because its contactors emphasize reliable making and breaking under inductive loads, which is the same engineering problem lithium-ion conversions create when pack voltage sag changes the arc behavior.

4. GIGAVAC (Amphenol)

Known for sealed DC contactors and relays with ceramic-to-metal construction. Included for buyers who need higher protection against moisture ingress in wash-down cleaning environments and want to compare sealed architectures against the IP-rated options in the list.

5. TE Connectivity

Offers high-voltage and high-current contactors and relays under its Kilovac line. Its relevance here is as a reference for larger lithium-ion pack configurations where switching voltage moves above the 96V D.C. ceiling typical of the compact cleaning-machine contactors.

6. Sensata Technologies

Supplies contactors and battery-related components for electrified industrial and vehicle platforms. Useful comparison point for buyers integrating contactors into a broader lithium-ion battery management architecture.

7. Curtis Instruments

Provides motor controllers and associated power components widely used in battery-powered floor care and utility vehicles. Its inclusion reflects the fact that controller compatibility often determines which contactor a cleaning machine OEM can drop in without reworking the harness.

Conclusion

Sourcing low-voltage DC contactors for a lithium-ion cleaning equipment upgrade comes down to matching published specifications to the machine, not to the brand name. Four checks cover most of the risk. First, size the contactor on continuous rated heating current rather than peak inrush, since lithium-ion packs hold voltage higher under load and continuous duty becomes the limiting factor. Second, confirm the model’s maximum contact voltage in both modes, without and with blowing magnetic, because 48V D.C. and 96V D.C. ceilings describe very different capabilities. Third, verify environmental protection and operating temperature against wash-down, humidity, and ambient conditions in the cleaning environment. Fourth, check the interface details that decide whether a part is a drop-in replacement: terminal type, main terminal torque range, mounting bracket hole spacing, contact pressure drop at rated current, and coil power consumption, which affects standby drain on a lithium pack. Buyers who collect those five data points from each supplier can compare candidates on equal terms regardless of which product family or country of origin they come from.