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This page is about the Soviet heavy tank KV-1S. For other versions, see KV-1 (Family).


GarageImage KV-1S.jpg

The KV-1S is a Rank II Soviet heavy tank with a battle rating of 4.0 (AB/RB/SB). It was introduced in Update 1.57 "Battle March". A lightened KV-1 made to improve its manoeuvrability, the KV-1S has less overall armour than the original design but keeps its same lethality with improved speed.

Compared to the KV-1 L-11, side and rear armour are decreased to 60 mm, lightening the vehicle and increasing its speed to maximum 43 kph. A new turret was installed, presenting a smaller profile, thicker armour, and better angling all around. The armament is also changed to the ZIS-5, the equivalent of its successor and the T-34's F-34 guns.

General info

Survivability and armour

Armour type:

  • Rolled homogeneous armour (Hull, Turret roof)
  • Cast homogeneous armour (Turret)
Armour Front (Slope angle) Sides Rear Roof
Hull 75 mm (30°) Front plate
50 mm (70°) Front glacis
25 + 50-60 mm (25-70°) Joint plate
60 mm (26-50°) Lower glacis
60 mm 60 mm (35-75°) Top
60 mm (2-69°) Bottom
40 mm Front
30 mm Rear
Turret 82 mm (2-76°) Turret front
50-75 mm (4-71°) Gun mantlet shield
90 mm (0-29°) Gun mantlet
82 mm (0-25°) 82 mm (27-56°)
75 mm (1-43°) Machine gun port
30 mm
Cupola 60 mm 30 mm


  • Suspension wheels are 20 mm thick, tracks are 30 mm thick.
  • The gun mantlet shield has varying thickness, thickest just a little above and below the centre 55 mm area.


Game Mode Max Speed (km/h) Weight (tons) Engine power (horsepower) Power-to-weight ratio (hp/ton)
Forward Reverse Stock Upgraded Stock Upgraded
Arcade 48 19 42.5 775 1145 18.24 26.94
Realistic 45 18 531 600 12.49 14.12


Main armament

Main article: ZiS-5 (76 mm)
76 mm ZiS-5 Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Stock Full Expert Aced
Arcade 114 -5°/+25° ±180° N/A 7.1 9.9 16.3 18.0 19.2 9.00 7.90 7.30 6.90
Realistic 7.1 8.4 10.2 11.3 12.0


The available ammunition allows for engaging all types of targets:

  • BR-350A (MD-5 fuze): APHEBC; a shell with high explosive mass that will one-shot any tank it penetrates but has an average penetration power.
  • BR-350P: APCR; a composite round with the best penetration but no explosive filler and will only penetrate flat vertical surfaces.
  • BR-350SP: APBC; a solid shot with an even better penetration but no explosive filler.
  • BR-350B (MD-8 fuze): APHEBC; same shell as the BR-350A but with increased penetration at the cost of slightly less explosive filler.
  • OF-350M: HE; useful for destroying open and lightly armoured vehicles.
  • Sh-354T: Shrapnel; useful against vehicles that are resistant to the HE shells but too thinly armoured to trigger the fuzes of AP shells.
  • D-350A: Smoke; useful to blind enemy vehicles that are too remote for you to disable so that you can progress towards objectives.
Penetration statistics
Ammunition Type of
Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
BR-350A (MD-5 fuze) APHEBC 87 85 76 67 59 52
BR-350P APCR 125 119 92 68 50 36
BR-350SP APBC 102 100 91 81 72 64
BR-350B (MD-8 fuze) APHEBC 94 92 83 73 65 57
OF-350M HE 10 10 10 10 10 10
Sh-354T Shrapnel 37 35 29 25 20 17
Shell details
Ammunition Type of
Mass (kg)
Fuse delay
Fuse sensitivity
Explosive Mass
(TNT equivalent) (g)
0% 50% 100%
BR-350A (MD-5 fuze) APHEBC 662 6.3 1.2 14 150 48° 63° 71°
BR-350P APCR 950 3.02 N/A N/A N/A 66° 70° 72°
BR-350SP APBC 655 6.78 N/A N/A N/A 48° 63° 71°
BR-350B (MD-8 fuze) APHEBC 655 6.3 0.9 14 108.8 48° 63° 71°
OF-350M HE 680 6.2 0.05 0.1 621 79° 80° 81°
Sh-354T Shrapnel 680 6.2 0.5 8 85 62° 69° 73°
Smoke shell characteristics
Ammunition Velocity
Mass (kg)
Screen radius
Screen deploy time
Screen hold time
Explosive Mass
(TNT equivalent) (g)
D-350A 680 6.45 13 5 20 50

Ammo racks

Ammo racks of the KV-1S
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
rack empty
114 110 (+4) 105 (+9) 100 (+14) 68 (+46) 36 (+78) 24 (+90) (+113) No


  • As they are modeled by sets of 2, shells disappear from the rack only after you fire both shells in the set.
  • Turret empty: 100 (+14) shells.

Machine guns

Main article: DT (7.62 mm)
7.62 mm DT
Mount Capacity (Belt) Fire rate Vertical Horizontal
Coaxial 1,890 (63) 600 N/A N/A

The small calibre of the DT machine gun makes it largely ineffective against all armoured vehicles but the ones with an open compartment. It still can be used to ping targets as a rangefinding help or to mow down minor obstacles blocking your line of sight.

Usage in battles

When playing the KV-1S, remember that you are still a heavy tank. Keep your front armour facing your enemies at all times, and preferably angled (but slightly less than KV-1 (L-11)). The turret is more durable and can deflect more shots than before, so if possible expose your turret only. Gun has no special penetration value, so try to target weak spots or areas with the least armour. Flanking attacks could end in a fiery demise. Also, this tank is still a KV-1 in its heart.

The best tactics for this tank is: keep a low profile and stay behind the main assault. When your team has advanced to the enemy's base, the KV-1s is best used to round up straggling enemy tanks behind your lines. If these tanks aren't destroyed, they'll attack your team's rear.

The common enemies are armed with guns that usually can penetrate the driver's hatch. Watch out for enemy T-34 (especially mod. 1941 and 1942, sometimes mods 1943 and the 57 variants), since they can flank you easily. Also, watch out for all German Pz.IV & StuG armed with long 7.5 cm gun, as it can penetrate your front armour even if you are angled.

This vehicle (due to its higher BR) can also meet many opponents that your armor has no chance of stopping, avoid direct confrontation with them. (Includes: T-34-85, SU-85, Dicker Max & Nashorn, Sherman Firefly & Achilles)

Meeting other KV-1's and Churchill may become a stalemate as the KV-1S gun may not penetrate against their formidable armour. This leads to the hope that the APCR ammunition works, and the firing of several rounds into the target for penetration.


Tier Mobility Protection Firepower
I Tracks Parts Horizontal Drive BR-350SP
II Suspension Brake System FPE Adjustment of Fire BR-350B (MD-8 fuze)
III Filters Crew Replenishment Elevation Mechanism BR-350P
IV Transmission Engine D-350A

Pros and cons


  • Faster than its predecessor and successor, yet frontal armor is the same
  • Very hard to knock out in one shot
  • Adequate gun
  • Bouncy turret front
  • Wide tracks make for good cross-country performance
  • Resilient. Can remain reasonably effective, even with a lot of damage
  • Very effective overall


  • Side armour is considerably weaker (75 mm into 60 mm)
  • Turret is cramped
  • Very low reverse speed, poor low-speed handling
  • Vulnerable to the long-barreled 75mm gun of the StuG III and Pz.IV F2,G, H and J
  • First reverse gear presents a slow reverse speed of around -5 kph.
  • Still carries most of the flaws of the KV-1 L-11
  • Still a heavy vehicle, poor acceleration.
  • Still cannot move on pace with T-34s
  • Gun lacks penetration against heavier opponents: The KV-1 ZiS-5 and both Churchills are very hard to get through. APCR is unreliable.


During operation Barbarossa, the KV-1 (Family) of tanks had gained weight in armor due to the increased need for armor. Due to this the KV-1S tank was designed. Major changes included:

  • a new planetary gear transmission improving reliability and allowing the use of regenerative steering
  • a new lower profile cast steel turret with a commanders cupola

These changes did bring in to question the usefulness of the tank due to the reduced weight necessitating a reduction in the armor thickness making more akin to the T-34 (Family) [1]



See also

Vehicles equipped with the same chassis
Other vehicles of similar configuration and role

External links


USSR heavy tanks
KV  KV-1 (L-11) · KV-1 (ZiS-5) · KV-1E · KV-1S · KV-85 · KV-122 · KV-220
  KV-2 (1939) · KV-2 (1940) · KV-2 (ZiS-6)
IS  IS-1 · IS-2 · IS-2 (1944) · IS-2 "Revenge" · IS-3 · IS-4M · IS-6 · IS-7 · T-10A · T-10M
Other  Object 279
Multi-turreted  SMK · T-35
Lend-Lease  ▂MK-II "Matilda"