Motor lock STEP 551

– a powerful and fast motor lock for door environments with high-security requirements

STEP 551 is a motor lock with hook bolt for door environments with high-security requirements. The lock can be used as both a night lock and an extremely secure day lock. It is designed for high-frequency door environments.

The lock case is made of stainless steel and has a modern bolt placement with the hook bolt located in the center of the lock case. This powerful lock can be installed in door environments that are used frequently.

For door environments with the toughest burglary requirements

STEP 551 is one of the most secure motor locks on the market and can be installed in door environments with the most stringent burglary protection requirements. The hook bolt is extremely strong, fast, and can withstand significant stress.

The lock is certified for the highest burglary protection, class 5, according to SSF 3522, as well as Grade 7 according to EN 14846:2008. It can be included as a locking mechanism in many well-reputed security door fittings for class RC3 and RC4.

STEP 551 has an extremely strong hook bolt that is also blocked and locked in the closed position. The breaking strength is 56 kN (5,600 kg). The lock also has a panic lock function.

Evacuation and re-entry

STEP 551 also serves as an evacuation lock in SSF 3522 class 2B when used with STEP Exit emergency exit devices. Certified according to EN 179:2008.

During evacuation, the control unit can manage re-locking or re-entry in several ways that can be customized to the needs of the facility. Continuous re-entry, time-controlled, and/or fire alarm-controlled.

Recovery of the re-entry mode can be done with a key, a reset input, or a reset fire alarm.

For doors with fire safety requirements

Certified in fire resistance class E/EI120 according to EN 14846:2008 in combination with a latch lock.

Control unit with many smart features

The control unit ST500C uses encrypted communication OSDP AES-128 for locking, unlocking and status indications. It can handle up to two motor locks. These can be controlled individually or synchronized for connection to access control systems, alarms and central function.

Re-entry options

With STEP 551, you have the ability to configure several different re-entry options through the control unit:

No re-entry
Fire alarm-triggered re-entry
Mechanical re-entry + optional fire alarm-triggered (override)
Timed re-entry 3-60 minutes + optional fire alarm-triggered (override)

The re-entry function can be reset via a key, reset signal, or reset fire alarm.

Manipulation protected barrier

The lock has a double blocking, where the hook bolts block also has a manipualtion protected barrier. The barrier’s position is monitored by an optical sensor, ensuring that it is indeed locked. The barrier is completely shielded from access, thus providing protection against tampering.

With unique FreeDrive^®technology

The FreeDrive^® technology enables the locks motor and gearbox to disengages every time the door unlocks mechanically. This means that the wear minimizes when using lever handle, knob, keys or emergency exit device. Locks with FreeDrive^® used together with STEP Exit on doors with emergency exits can therefore be used thousands of times every day.

Push play and learn more in our motor lock movie below

Functional description STEP 551

The hook bolt locks/unlocks electrically via opening signal from access control system, code lock, push button or similar.
The hook bolt locks/unlocks mechanically via the cylinder follower.

Combine with STEP Exit to maximize the benefits of FreeDrive^®

Combine with the STEP Exit emergency exit device to create a safer evacuation route with unparalleled user-friendliness and, furthermore, to maximize the benefits of the FreeDrive^® technology.

The FreeDrive^® technology disconnects the motor and gearbox, meaning that they are never affected when the exit device’s lever is used. As a result, the impact on the motor and gearbox is minimized, even if the exit device is used thousands of times each day.

Go to STEP Exit for STEP 551

Fire approved: E/EI 120*
(* in combination with other lock.)

Security: Grade 7 SS-EN 14846. + Klass 5 SSF-3522.

Certified according to: EN 179:2008

Factory tested: 1 700 000 cycles

Functional description

The hook bolt locks/unlocks electrically via opening signal from access control system, code lock, push button or similar.
The hook bolt locks/unlocks mechanically via the cylinder follower.

Certificates

Certified in class 5 according to SSF 3522.
Certified in Grade 7 according to EN 14846.
Certified in Grade L for corrosion, temperatures and humidity, which corresponds to high requirements according to EN 14846.
Certified in fire technical class E/EI120 according EN 14846:2008 in combination with a latch lock.
Certified for evacuation according to EN 179:2008.

Product characteristics

Unlocks in less than 0.1 second.
Modern bolt placement.
56 kN (5 600 kg) breaking strength.
Panic lock function.
Durable material choises with lock case in stainless steel.
FreeDrive^® technology.
Manipulation-protected barrier technology.
Back set 50 mm.
Encrypted communication OSDP AES-128.
Power consumption: 32 mA at rest, max 255 mA for about 20 ms.
Guarantees opening even if the door is subjected to pressure of up to 5 kg.
Evacuation and re-entry are ensured together with STEP Exit emergency exit devices.

Status indicators for

Bolt locked
Bolt open
Lock alarm
Door open/closed
Exit alarm
Four programmable AUX outputs. Choose from the following:

- Vital open (door open)
- Vital closed (door closed and locked)
- Service
- Tamper
- Exit alarm
- Door alarm
- Timer failed
- Timer unlocked
- Timer locked
- Door auto (activation of door automation after unlocking)

Environment

The control unit can handle temperatures from -5 to +70 degrees.
The lock can withstand temperatures from -20 to +70 degrees.

Article number	E-nr	Description
ST551	5867803	STEP 551 Motor lock. Incl. ST551, connection cable with adapter ST0917H, drill protection ST1199, screw and connector set ST1192.
ST551LB	5867805	STEP 551 Motor lock set with Motor lock and control unit. Incl. ST551, STEP Control unit ST500C, connection cable with adapter ST0917H, drill protection ST1199, screw and connector set ST1192.
ST551KPL	5867804	STEP 551 complete set. Incl. ST551, STEP Control unit ST500C, STEP Lead cover ST1283, 10 m connection cable ST0916H, mechanical strike plate ST9009-15, connection cable with adapter ST0917H, drill protection ST1199, screw and connector set ST1192.