DS-K4H250S Magnetic Lock, 272 kg Holding Force, 12/24 V, LED Status

Introduction: DS-K4H250S Magnetic Lock and its key features

DS-K4H250S Magnetic Lock 6 Pro Seriesis a compact, surface-mounted electromagnetic lock designed to deliver a secure, reliable holding solution for single-leaf doors. With an official holding force of 272 kg (approximately 600 lb), selectable 12/24 V DC operation, and clear LED status indication, the DS-K4H250S targets installers and facilities managers who need a balance of power, flexibility and compact form factor. Priced competitively (suggested price: $89.99), it provides many of the features expected from modern access-control hardware while staying simple to install and integrate.

• Holding force:272 kg (599.8 lb) linear thrust
• Voltage:Selectable 12 V DC (500 mA) or 24 V DC (250 mA)
• Status indication:LED indicator (Green = locked; Red = unlocked)
• Signal output:Dry contact output (max 3 A) for monitoring lock state
• Protection:Internal MOV for transient protection; durable hard-anodised shell and zinc-plated armature
• Form factor:Compact dimensions (240 49 25.5 mm)

Detailed specifications and benefits

The DS-K4H250S is built with a clear focus on performance, reliability and installer convenience. Below are the technical specifications followed by practical benefits that these specifications deliver in real-world use:

• Model:DS-K4H250S
• Holding force:272 kg (599.8 lb)
• Power supply:12 V DC (500 mA) or 24 V DC (250 mA) selectable
• Indicator:LED 6 Green = locked; Red = unlocked
• Signal output:Dry contact (max 3 A); normally open while locking, normally closed while unlocking
• Transient protection:Internal MOV (surge protection)
• Materials/finish:Hard-anodised shell; zinc-plated armature
• Dimensions (lock body):240 49 25.5 mm
• Dimensions (armature plate):180 38 11 mm
• Weight:2.1 kg
• Working temperature:-10 to +55 C
• Working humidity:0 95% RH
• Door types:Single leaf (wood, glass, metal, fire-rated)
• Optional accessories:Bracket kits: DS-K4H250-LZ, DS-K4H250-U
• Datasheet:https://assets.hikvision.com/prd/public/all/doc/m000001538/DS-K4H250S_Datasheet_20250120.pdf

• Strong holding power:At 272 kg of linear thrust, the unit is more than adequate for most interior and exterior single-door applications, deterring forced entry attempts and improving door security without the size and expense of larger industrial units.
• Selectable voltage:The 12/24 V selectable operation makes the lock easier to integrate with existing door controllers and power systems. Installers can choose the setting that best matches their site wiring and power budget.
• Clear visual status:The dual-colour LED simplifies commissioning and daily monitoring: a quick glance indicates whether the lock is engaged or released, reducing diagnostic time for technicians and operators.
• Monitoring and integration:The dry-contact output (NO/NC behavior) provides a simple means to feed lock state into an access control panel or building management system for audit and alarm integration.
• Electrical protection:Internal MOV reduces risk from voltage spikes and improves long-term reliability in installations subject to transient disturbances.
• Durability and finish:Hard-anodised and zinc-plated components resist wear and corrosion, improving lifetime in high-traffic or exposed environments.

Use cases and scenarios where the DS-K4H250S excels

The DS-K4H250S is well suited to a wide range of commercial and institutional settings. Its combination of holding force, compact size and monitoring features make it a versatile option for many installations:

• Office buildings:Secure interior or exterior entry points where controlled access is required. The LED status and dry-contact monitoring integrate with access control panels and help in troubleshooting.
• Retail environments:Back-of-house doors, stockrooms and staff-only areas benefit from a reliable electromagnetic lock that wont take up much visible space.
• Medical and laboratory facilities:Clean, compact design suits doors where a low-profile security device is needed and monitoring of door state is important for compliance or workflow.
• Server rooms and IT closets:Strong holding force helps protect critical infrastructure; selectable voltage eases integration with existing power supplies.
• Glass and aluminium doors:With appropriate brackets (optional), the lock can be used on glass, timber and metal single-leaf doors where a surface-mounted solution is preferred.
• Education and institutional sites:Classrooms, labs and administrative offices that require controlled access, with status indication for quick checks by security staff.

Note: Electromagnetic locks require consideration of egress and local fire safety regulations. Installers should verify code compliance and, where required, provide fail-safe arrangements, timed-release circuits, or battery backup to maintain safe emergency egress.

How the DS-K4H250S compares with similar products

When choosing an electromagnetic lock, buyers typically compare holding force, size, power options, monitoring features and durability. Heres how the DS-K4H250S stacks up against common product classes and features in the market:

• Light-duty locks (e.g., 120 60 kg) are cheaper and smaller but may not provide sufficient resistance for exterior doors or high-risk entry points. The DS-K4H250Ss 272 kg rating gives a stronger security margin for many commercial doors while remaining compact and cost-effective.

• Heavy-duty locks rated above 450 600 kg offer greater forced-entry resistance but are bulkier, heavier and usually more expensive. The DS-K4H250S is a middle-ground option that suits the majority of single-leaf commercial doors where a full heavy-duty solution would be overkill in cost and form factor.

• Electric strikes replace part of the door frame and allow mechanical latching, offering fail-secure options and compatibility with latch-type locks. Electromagnetic locks like the DS-K4H250S provide a no-latch, strong clamping force and simpler surface-mount installation. Each has pros and cons: maglocks are typically easier to retrofit and offer clean aesthetics, while strikes are often preferred when maintaining mechanical latch behavior is required.

• Many competing maglocks offer single-voltage operation or lack integrated LED status. The DS-K4H250Ss selectable 12/24 V option and built-in LED and dry-contact outputs make it more installer-friendly and faster to integrate into existing access-control systems than many low-cost alternatives.

Customer feedback and typical installer reviews

While individual experiences vary by site and installer skill, aggregated feedback from integrators and end-users for products in this class highlights a few consistent themes. Below are typical, anonymised observations reflecting common user perspectives rather than verbatim testimonials:

• Installers appreciate the selectable voltage:Reduces the need for extra transformers or re-wiring when replacing older locks that use different supply voltages.
• LED status is helpful:Field technicians and facility managers report that the clear green/red LED speeds up testing and daily checks, especially on multi-door projects.
• Compact size and finish:Positive notes on aesthetics and the hard-anodised finish for high-traffic areas where scuffing is a concern.
• Reliable hold:Customers upgrading from light-duty locks often cite the added confidence from the 272 kg rating for exterior and higher-traffic doors.
• Integration requests:Some customers ask for additional accessories or mounting plates for specialised frameless glass doors; the availability of bracket kits addresses many of these needs.

Conclusion: Why choose the DS-K4H250S?

The DS-K4H250S Magnetic Lock is a balanced choice for many access-control projects. It combines a robust 272 kg holding force with flexible 12/24 V operation, useful monitoring outputs and a clear LED status indicator, all in a compact, durable housing. For installers and facilities managers seeking a cost-effective, versatile electromagnetic lock for single-leaf doors—especially where space is limited and integration simplicity matters—the DS-K4H250S represents strong value (suggested price $89.99) and practical functionality.

Before installation, always review the official datasheet and confirm local building and fire-egress regulations. For technical details and mounting guidance, consult the manufacturers datasheet: https://assets.hikvision.com/prd/public/all/doc/m000001538/DS-K4H250S_Datasheet_20250120.pdf